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Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands | 2007 Incentive Plan [Member] Common Stock [Member] Common Class A [Member] | 2007 Incentive Plan [Member] Common Stock [Member] | 2007 Incentive Plan [Member] Retained Earnings [Member] | 2007 Incentive Plan [Member] Treasury Stock [Member] Common Class A [Member] | 2007 Incentive Plan [Member] Treasury Stock [Member] | 2007 Incentive Plan [Member] AOCI Attributable to Parent [Member] | 2007 Incentive Plan [Member] | The 2017 Equity and Incentive Compensation Plan [Member] Common Stock [Member] Common Class A [Member] | The 2017 Equity and Incentive Compensation Plan [Member] Common Stock [Member] | The 2017 Equity and Incentive Compensation Plan [Member] Treasury Stock [Member] Common Class A [Member] | The 2017 Equity and Incentive Compensation Plan [Member] Treasury Stock [Member] | Common Stock [Member] Common Class A [Member] | Common Stock [Member] | Retained Earnings [Member] | Treasury Stock [Member] Common Class A [Member] | Treasury Stock [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  | 7,855,381 | 70,989,426 |  | (1,611,371) | (4,882,705) |  |
Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  | $ 19,325 | $ 655,446 | $ (163,638) | $ (22,685) | $ (41,890) | $ (17,284) | $ 429,274
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,273 |  |  |  | 62,273
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (361) | (361)
401(k) plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 2,571 |  |  |  |  |
401(k) plan |  |  |  |  |  |  |  |  |  |  |  |  | $ 29 |  |  |  |  | 29
Restricted stock awards (in shares) | 218,612 | 237,500 |  | (57,760) | (60,518) |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock awards |  |  |  | $ (655) | $ (798) |  | $ (1,453) |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (192,183) |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,000) |  | (2,000)
Share-based compensation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  | $ 2,439 | $ 2,660 |  |  |  |  | 5,099
Balance (in shares) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  | 8,073,993 | 71,229,497 |  | (1,669,131) | (5,135,406) |  |
Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  | $ 21,764 | $ 658,135 | (101,365) | $ (23,340) | $ (44,688) | (17,645) | 492,861
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 261,952 |  |  |  | 261,952
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,520) | (4,520)
401(k) plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,224 |  |  |  |  |
401(k) plan |  |  |  |  |  |  |  |  |  |  |  |  | $ 15 |  |  |  |  | 15
Restricted stock awards (in shares) | 198,220 | 307,943 |  | (81,561) | (77,632) |  |  | 76,856 |  |  |  |  |  |  |  |  |  |
Restricted stock awards |  |  |  | $ (892) | $ (874) |  | $ (1,766) |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (322,038) |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (4,000) |  | (4,000)
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  | 2,880 | 5,423 |  |  |  |  | 8,303
Adoption of ASU 2016-09 excess tax benefit for stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,107 |  |  |  | 1,107
Underwritten public offering (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 17,250,000 |  |  |  |  |
Underwritten public offering |  |  |  |  |  |  |  |  |  |  |  |  | $ 238,945 |  |  |  |  | 238,945
Balance (in shares) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  | 8,349,069 | 88,788,664 |  | (1,750,692) | (5,535,076) |  |
Balance at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  | $ 24,644 | $ 902,518 | 161,694 | $ (24,232) | $ (49,562) | (22,165) | 992,897
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 210,803 |  |  |  | 210,803
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 788 | 788
Restricted stock awards (in shares) |  |  |  |  |  |  |  |  |  |  |  | 220,080 | 391,836 |  | (89,422) | (107,456) |  |
Restricted stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,252) | $ (1,757) |  | (3,009)
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,551,710) |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (19,607) |  | (19,607)
Share-based compensation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  | $ 2,042 | $ 5,147 |  |  |  |  | 7,189
Restricted stock unit awards (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 209,500 |  |  | (82,201) |  |
Restricted stock unit awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,344) |  | (1,344)
Forefiture of restricted stock awards (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (91,057) |  |  |  |  |
Forefiture of restricted stock awards |  |  |  |  |  |  |  |  |  |  |  |  | $ (528) |  |  |  |  | (528)
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  | 8,569,149 | 89,298,943 |  | (1,840,114) | (7,276,443) |  |
Balance at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  | $ 26,686 | $ 907,137 | $ 372,497 | $ (25,484) | $ (72,270) | $ (21,377) | $ 1,187,189

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