| Share-based Payment Arrangement, Option, Activity [Table Text Block] |
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Weighted |
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Weighted |
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Average |
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Average |
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Remaining |
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Aggregate |
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Exercise |
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Contractual |
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Intrinsic |
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Shares |
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Price |
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Term (years) |
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Value |
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(In Thousands) |
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| Nine Months Ended September 30, 2019: |
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| Outstanding at January 1, 2019 |
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1,238,748 |
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$ |
13.02 |
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5.2 |
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$ |
23,355 |
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| Granted |
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10,500 |
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34.44 |
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9.4 |
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(14 |
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| Exercised |
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(239,300 |
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7.02 |
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2.3 |
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6,162 |
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| Forfeited |
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(20,200 |
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24.88 |
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6.5 |
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167 |
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| Outstanding at September 30, 2019 |
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989,748 |
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14.46 |
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5.0 |
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$ |
18,603 |
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| Exercisable at September 30, 2019 |
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278,000 |
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$ |
7.36 |
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3.1 |
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$ |
7,261 |
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| Nine Months Ended September 30, 2018: |
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| Outstanding at January 1, 2018 |
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1,666,834 |
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$ |
10.68 |
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5.5 |
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$ |
51,377 |
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| Granted |
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12,750 |
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41.58 |
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9.5 |
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(31 |
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| Exercised |
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(231,336 |
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4.94 |
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3.1 |
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7,665 |
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| Forfeited |
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(33,000 |
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15.00 |
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6.4 |
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758 |
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| Outstanding at September 30, 2018 |
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1,415,248 |
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11.79 |
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5.1 |
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$ |
38,998 |
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| Exercisable at September 30, 2018 |
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693,100 |
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$ |
6.78 |
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3.5 |
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$ |
22,513 |
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| Nonvested Restricted Stock Shares Activity [Table Text Block] |
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Shares |
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Weighted Average Grant Date Fair Value |
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| Nine Months Ended September 30, 2019: |
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| Non-vested at January 1, 2019 |
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44,076 |
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$ |
38.44 |
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| Granted |
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33,774 |
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33.60 |
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| Vested |
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(5,200 |
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20.31 |
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| Forfeited |
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(2,500 |
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38.17 |
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| Non-vested at September 30, 2019 |
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70,150 |
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37.46 |
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| Nine Months Ended September 30, 2018: |
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| Non-vested at January 1, 2018 |
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120,676 |
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$ |
10.29 |
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| Granted |
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12,850 |
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41.48 |
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| Vested |
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(73,700 |
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5.88 |
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| Forfeited |
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(750 |
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41.21 |
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| Non-vested at September 30, 2018 |
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59,076 |
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22.18 |
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