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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect Period Of Adoption Adjustment [Member] | Class A and B Common Stock [Member] | Additional Paid-in Capital [Member] | Purchase Price Of Excess Of Predecessor Basis, Net Of Tax [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect Period Of Adoption Adjustment [Member] | Accumulated Other Comprehensive Income [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 769,872 |  | $ 419 | $ 173,011 | $ (15,458) | $ 870,716 |  | $ (194) | $ (258,622)
Beginning Balance (in shares) at Dec. 31, 2017 |  |  | 41,887,088 |  |  |  |  |  | (7,777,722)
Stock tendered for payments of withholding taxes | (4,270) |  |  |  |  |  |  |  | $ (4,270)
Stock tendered for payments of withholding taxes (in shares) |  |  |  |  |  |  |  |  | (87,381)
Issuance of restricted stock awards, net of forfeitures |  |  |  | (14,271) |  |  |  |  | $ 14,271
Issuance of restricted stock awards, net of forfeitures (in shares) |  |  |  |  |  |  |  |  | 434,020
Share-based compensation expense | 13,480 |  |  | 13,480 |  |  |  |  |
Net income | 201,740 |  |  |  |  | 201,740 |  |  |
Foreign currency translation adjustment | 12 |  |  |  |  |  |  | 12 |
Ending Balance at Dec. 31, 2018 | 980,834 | $ (26) | $ 419 | 172,220 | (15,458) | 1,072,456 | $ (26) | (182) | $ (248,621)
Ending Balance (in shares) at Dec. 31, 2018 |  |  | 41,887,088 |  |  |  |  |  | (7,431,083)
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  | us-gaap:AccountingStandardsUpdate201602Member |  |
Purchase of treasury shares | (24,998) |  |  |  |  |  |  |  | $ (24,998)
Purchase of treasury shares (in shares) |  |  |  |  |  |  |  |  | (626,320)
Stock tendered for payments of withholding taxes | (3,984) |  |  |  |  |  |  |  | $ (3,984)
Stock tendered for payments of withholding taxes (in shares) |  |  |  |  |  |  |  |  | (98,260)
Issuance of restricted stock awards, net of forfeitures |  |  |  | (8,869) |  |  |  |  | $ 8,869
Issuance of restricted stock awards, net of forfeitures (in shares) |  |  |  |  |  |  |  |  | 284,775
Share-based compensation expense | 16,286 |  |  | 16,286 |  |  |  |  |
Net income | 107,171 |  |  |  |  | 107,171 |  |  |
Foreign currency translation adjustment | (4) |  |  |  |  |  |  | (4) |
Ending Balance at Dec. 31, 2019 | $ 1,075,279 |  | $ 419 | 179,637 | (15,458) | 1,179,601 |  | (186) | $ (268,734)
Ending Balance (in shares) at Dec. 31, 2019 |  |  | 41,887,088 |  |  |  |  |  | (7,870,888)
Purchase of treasury shares (in shares) | (148,242) |  |  |  |  |  |  |  |
Stock tendered for payments of withholding taxes | $ (7,963) |  |  |  |  |  |  |  | $ (7,963)
Stock tendered for payments of withholding taxes (in shares) |  |  |  |  |  |  |  |  | (148,242)
Issuance of restricted stock awards, net of forfeitures |  |  |  | (10,632) |  |  |  |  | $ 10,632
Issuance of restricted stock awards, net of forfeitures (in shares) |  |  |  |  |  |  |  |  | 344,046
Share-based compensation expense | 17,053 |  |  | 17,053 |  |  |  |  |
Net income | 73,559 |  |  |  |  | 73,559 |  |  |
Foreign currency translation adjustment | (5) |  |  |  |  |  |  | (5) |
Ending Balance at Dec. 31, 2020 | $ 1,157,923 |  | $ 419 | $ 186,058 | $ (15,458) | $ 1,253,160 |  | $ (191) | $ (266,065)
Ending Balance (in shares) at Dec. 31, 2020 |  |  | 41,887,088 |  |  |  |  |  | (7,675,084)

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