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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Scenario, Previously Reported [Member] Calculated under Revenue Guidance in Effect before Topic 606 [Member] Common Stock [Member] | Scenario, Previously Reported [Member] Calculated under Revenue Guidance in Effect before Topic 606 [Member] Additional Paid- In Capital [Member] | Scenario, Previously Reported [Member] Calculated under Revenue Guidance in Effect before Topic 606 [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Scenario, Previously Reported [Member] Calculated under Revenue Guidance in Effect before Topic 606 [Member] Retained Earnings [Member] | Scenario, Previously Reported [Member] Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Retained Earnings [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Common Stock [Member] | Additional Paid- In Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 |  |  |  |  |  |  |  | $ 12 | $ 2,672 | $ (165) | $ 93,497 |  | $ 96,016
Balance (in shares) at Dec. 31, 2016 |  |  |  |  |  |  |  | 12,027 |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 27,721 |  | 27,721
Share-based compensation |  |  |  |  |  |  |  |  | 4,267 |  |  |  | 4,267
Share-based compensation (in shares) |  |  |  |  |  |  |  | 95 |  |  |  |  |
Options exercised by executives and directors |  |  |  |  |  |  |  |  | 568 |  |  |  | 568
Options exercised by executives and directors (in shares) |  |  |  |  |  |  |  | 25 |  |  |  |  |
Net shares repurchased for employee taxes |  |  |  |  |  |  |  |  | (2,540) |  |  |  | (2,540)
Net shares repurchased for employee taxes, (in shares) |  |  |  |  |  |  |  | (44) |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 5 |  |  | 5
Cash dividends declared to stockholders |  |  |  |  |  |  |  |  |  |  | (17,456) |  | (17,456)
Balance at Dec. 31, 2017 | $ 12 | $ 4,967 | $ (160) | $ 103,762 | $ 108,581 |  |  | $ 12 | 4,967 | (160) | 101,744 |  | 106,563
Balance (in shares) at Dec. 31, 2017 | 12,103 |  |  |  |  |  |  | 12,103 |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards |  |  |  |  |  | $ (2,018) | $ (2,018) |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 55,789 |  | 55,789
Share-based compensation |  |  |  |  |  |  |  |  | 3,124 |  |  |  | 3,124
Share-based compensation (in shares) |  |  |  |  |  |  |  | 19 |  |  |  |  |
Options exercised by executives and directors |  |  |  |  |  |  |  |  | 547 |  |  |  | 547
Options exercised by executives and directors (in shares) |  |  |  |  |  |  |  | 34 |  |  |  |  |
Net shares repurchased for employee taxes |  |  |  |  |  |  |  |  | (720) |  |  |  | (720)
Net shares repurchased for employee taxes, (in shares) |  |  |  |  |  |  |  | (7) |  |  |  |  |
Restricted shares forfeitures |  |  |  |  |  |  |  | (40) |  |  |  |  |
Treasury stock from cashless options |  |  |  |  |  |  |  |  | 884 |  |  | $ (884) |
Treasury stock from cashless options, (in shares) |  |  |  |  |  |  |  | 8 |  |  |  |  |
Treasury stock from stock repurchases |  |  |  |  |  |  |  |  |  |  |  | (29,995) | (29,995)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | (13) |  |  | (13)
Cash dividends declared to stockholders |  |  |  |  |  |  |  |  |  |  | (26,189) |  | (26,189)
Balance at Dec. 31, 2018 |  |  |  |  |  |  |  | $ 12 | 8,802 | (173) | 131,344 | (30,879) | 109,106
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  | 12,117 |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 77,916 |  | 77,916
Share-based compensation |  |  |  |  |  |  |  |  | 4,520 |  |  |  | 4,520
Share-based compensation (in shares) |  |  |  |  |  |  |  | 273 |  |  |  |  |
Options exercised by executives and directors |  |  |  |  |  |  |  |  | 278 |  |  |  | 278
Options exercised by executives and directors (in shares) |  |  |  |  |  |  |  | 10 |  |  |  |  |
Net shares repurchased for employee taxes |  |  |  |  |  |  |  |  | $ (13,600) |  | (492) |  | (14,092)
Net shares repurchased for employee taxes, (in shares) |  |  |  |  |  |  |  | (128) |  |  |  |  |
Treasury stock from stock repurchases |  |  |  |  |  |  |  |  |  |  |  | (33,114) | (33,114)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 198 |  |  | 198
Cash dividends declared to stockholders |  |  |  |  |  |  |  |  |  |  | (39,980) |  | (39,980)
Balance at Dec. 31, 2019 |  |  |  |  |  |  |  | $ 12 |  | $ 25 | $ 168,788 | $ (63,993) | $ 104,832
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  | 12,272 |  |  |  |  |

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