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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Scenario, Previously Reported [Member] Common Stock [Member] | Scenario, Previously Reported [Member] Additional Paid- In Capital [Member] | Scenario, Previously Reported [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Scenario, Previously Reported [Member] Retained Earnings [Member] | Scenario, Previously Reported [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
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Cumulative effect adjustments from changes in accounting standards |  |  |  |  |  | $ (2,018) | $ (2,018) |  |  |  |  |  |
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 |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 12,222 |  | 12,222
Share-based compensation |  |  |  |  |  |  |  |  | 805 |  |  |  | 805
Share-based compensation (in shares) |  |  |  |  |  |  |  | 16 |  |  |  |  |
Options exercised by executives and directors |  |  |  |  |  |  |  |  | 62 |  |  |  | 62
Options exercised by executives and directors (in shares) |  |  |  |  |  |  |  | 14 |  |  |  |  |
Net shares repurchased for employee taxes |  |  |  |  |  |  |  |  | (215) |  |  |  | (215)
Net shares repurchased for employee taxes, (in shares) |  |  |  |  |  |  |  | (3) |  |  |  |  |
Treasury stock from cashless options |  |  |  |  |  |  |  |  | 750 |  |  | $ (750) |
Treasury stock from cashless options, (in shares) |  |  |  |  |  |  |  | 9 |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | (84) |  |  | (84)
Cash dividends declared to stockholders |  |  |  |  |  |  |  |  |  |  | (5,723) |  | (5,723)
Balance at Mar. 31, 2018 |  |  |  |  |  |  |  | $ 12 | 6,369 | (244) | 108,243 | (750) | 113,630
Balance (in shares) at Mar. 31, 2018 |  |  |  |  |  |  |  | 12,139 |  |  |  |  |
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 |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 40,136
Net shares repurchased for employee taxes, (in shares) |  |  |  |  |  |  |  | (3) |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (106)
Balance at Sep. 30, 2018 |  |  |  |  |  |  |  | $ 12 | 8,040 | (266) | 124,601 | (20,746) | 111,641
Balance (in shares) at Sep. 30, 2018 |  |  |  |  |  |  |  | 12,145 |  |  |  |  |
Balance at Mar. 31, 2018 |  |  |  |  |  |  |  | $ 12 | 6,369 | (244) | 108,243 | (750) | 113,630
Balance (in shares) at Mar. 31, 2018 |  |  |  |  |  |  |  | 12,139 |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 14,133 |  | 14,133
Share-based compensation |  |  |  |  |  |  |  |  | 830 |  |  |  | 830
Options exercised by executives and directors (in shares) |  |  |  |  |  |  |  | 2 |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 25 |  |  | 25
Treasury stock from stock repurchases |  |  |  |  |  |  |  |  |  |  |  | (19,996) | (19,996)
Cash dividends declared to stockholders |  |  |  |  |  |  |  |  |  |  | (5,759) |  | (5,759)
Balance at Jun. 30, 2018 |  |  |  |  |  |  |  | $ 12 | 7,199 | (219) | 116,617 | (20,746) | 102,863
Balance (in shares) at Jun. 30, 2018 |  |  |  |  |  |  |  | 12,141 |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 13,781 |  | 13,781
Share-based compensation |  |  |  |  |  |  |  |  | 717 |  |  |  | 717
Options exercised by executives and directors |  |  |  |  |  |  |  |  | 158 |  |  |  | 158
Options exercised by executives and directors (in shares) |  |  |  |  |  |  |  | 4 |  |  |  |  |
Net shares repurchased for employee taxes |  |  |  |  |  |  |  |  | (34) |  |  |  | (34)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | (47) |  |  | (47)
Cash dividends declared to stockholders |  |  |  |  |  |  |  |  |  |  | (5,797) |  | (5,797)
Balance at Sep. 30, 2018 |  |  |  |  |  |  |  | $ 12 | 8,040 | (266) | 124,601 | (20,746) | 111,641
Balance (in shares) at Sep. 30, 2018 |  |  |  |  |  |  |  | 12,145 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 20,750 |  | 20,750
Share-based compensation |  |  |  |  |  |  |  |  | 990 |  |  |  | 990
Options exercised by executives and directors |  |  |  |  |  |  |  |  | 269 |  |  |  | 269
Options exercised by executives and directors (in shares) |  |  |  |  |  |  |  | 10 |  |  |  |  |
Net shares repurchased for employee taxes |  |  |  |  |  |  |  |  | (256) |  |  |  | (256)
Net shares repurchased for employee taxes, (in shares) |  |  |  |  |  |  |  | (1) |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 127 |  |  | 127
Cash dividends declared to stockholders |  |  |  |  |  |  |  |  |  |  | (8,918) |  | (8,918)
Balance at Mar. 31, 2019 |  |  |  |  |  |  |  | $ 12 | 9,805 | (46) | 143,176 | (30,879) | 122,068
Balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  |  | 12,126 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | 58,035
Net shares repurchased for employee taxes, (in shares) |  |  |  |  |  |  |  | (1) |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 245
Balance at Sep. 30, 2019 |  |  |  |  |  |  |  | $ 12 | 12,207 | 72 | 162,902 | (63,993) | 111,200
Balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  |  | 12,126 |  |  |  |  |
Balance at Mar. 31, 2019 |  |  |  |  |  |  |  | $ 12 | 9,805 | (46) | 143,176 | (30,879) | 122,068
Balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  |  | 12,126 |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 21,383 |  | 21,383
Share-based compensation |  |  |  |  |  |  |  |  | 1,255 |  |  |  | 1,255
Options exercised by executives and directors |  |  |  |  |  |  |  |  | 10 |  |  |  | 10
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 102 |  |  | 102
Treasury stock from stock repurchases |  |  |  |  |  |  |  |  |  |  |  | (9,998) | (9,998)
Cash dividends declared to stockholders |  |  |  |  |  |  |  |  |  |  | (8,797) |  | (8,797)
Balance at Jun. 30, 2019 |  |  |  |  |  |  |  | $ 12 | 11,070 | 56 | 155,762 | (40,877) | 126,023
Balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  |  | 12,126 |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 15,902 |  | 15,902
Share-based compensation |  |  |  |  |  |  |  |  | 1,170 |  |  |  | 1,170
Net shares repurchased for employee taxes |  |  |  |  |  |  |  |  | (33) |  |  |  | (33)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 16 |  |  | 16
Treasury stock from stock repurchases |  |  |  |  |  |  |  |  |  |  |  | (23,116) | (23,116)
Cash dividends declared to stockholders |  |  |  |  |  |  |  |  |  |  | (8,762) |  | (8,762)
Balance at Sep. 30, 2019 |  |  |  |  |  |  |  | $ 12 | $ 12,207 | $ 72 | $ 162,902 | $ (63,993) | $ 111,200
Balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  |  | 12,126 |  |  |  |  |

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