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UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | 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] | 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 | (4,262) |  |  |  |  |  | $ (4,262)
Stock tendered for payments of withholding taxes (in shares) |  |  |  |  |  |  | (87,206)
Issuance of restricted stock awards, net of forfeitures |  |  | (7,059) |  |  |  | $ 7,059
Issuance of restricted stock awards, net of forfeitures (in shares) |  |  |  |  |  |  | 252,207
Share-based compensation expense | 9,490 |  | 9,490 |  |  |  |
Net income | 152,829 |  |  |  | 152,829 |  |
Foreign currency translation adjustment | 26 |  |  |  |  | 26 |
Ending Balance at Sep. 30, 2018 | 927,955 | $ 419 | 175,442 | (15,458) | 1,023,545 | (168) | $ (255,825)
Ending Balance (in shares) at Sep. 30, 2018 |  | 41,887,088 |  |  |  |  | (7,612,721)
Beginning Balance at Jun. 30, 2018 | 811,060 | $ 419 | 168,614 | (15,458) | 908,935 | (190) | $ (251,260)
Beginning Balance (in shares) at Jun. 30, 2018 |  | 41,887,088 |  |  |  |  | (7,507,623)
Stock tendered for payments of withholding taxes | (245) |  |  |  |  |  | $ (245)
Stock tendered for payments of withholding taxes (in shares) |  |  |  |  |  |  | (4,941)
Issuance of restricted stock awards, net of forfeitures |  |  | 4,320 |  |  |  | $ (4,320)
Issuance of restricted stock awards, net of forfeitures (in shares) |  |  |  |  |  |  | (100,157)
Share-based compensation expense | 2,508 |  | 2,508 |  |  |  |
Net income | 114,610 |  |  |  | 114,610 |  |
Foreign currency translation adjustment | 22 |  |  |  |  | 22 |
Ending Balance at Sep. 30, 2018 | 927,955 | $ 419 | 175,442 | (15,458) | 1,023,545 | (168) | $ (255,825)
Ending Balance (in shares) at Sep. 30, 2018 |  | 41,887,088 |  |  |  |  | (7,612,721)
Beginning Balance at Dec. 31, 2018 | 980,834 | $ 419 | 172,220 | (15,458) | 1,072,456 | (182) | $ (248,621)
Beginning Balance (in shares) at Dec. 31, 2018 |  | 41,887,088 |  |  |  |  | (7,431,083)
Purchase of treasury shares | (24,998) |  |  |  |  |  | $ (24,998)
Purchase of treasury shares (in shares) |  |  |  |  |  |  | (626,320)
Stock tendered for payments of withholding taxes | (2,875) |  |  |  |  |  | $ (2,875)
Stock tendered for payments of withholding taxes (in shares) |  |  |  |  |  |  | (75,881)
Issuance of restricted stock awards, net of forfeitures |  |  | (8,905) |  |  |  | $ 8,905
Issuance of restricted stock awards, net of forfeitures (in shares) |  |  |  |  |  |  | 283,820
Share-based compensation expense | 12,434 |  | 12,434 |  |  |  |
Net income | 79,216 |  |  |  | 79,216 |  |
Adoption of ASU 2016-02 | ASU No. 2016-02 [Member] | (26) |  |  |  | (26) |  |
Foreign currency translation adjustment | (29) |  |  |  |  | (29) |
Ending Balance at Sep. 30, 2019 | 1,044,556 | $ 419 | 175,749 | (15,458) | 1,151,646 | (211) | $ (267,589)
Ending Balance (in shares) at Sep. 30, 2019 |  | 41,887,088 |  |  |  |  | (7,849,464)
Beginning Balance at Jun. 30, 2019 | 1,032,582 | $ 419 | 170,619 | (15,458) | 1,125,541 | (178) | $ (248,361)
Beginning Balance (in shares) at Jun. 30, 2019 |  | 41,887,088 |  |  |  |  | (7,369,052)
Purchase of treasury shares | (17,716) |  |  |  |  |  | $ (17,716)
Purchase of treasury shares (in shares) |  |  |  |  |  |  | (444,509)
Stock tendered for payments of withholding taxes | (129) |  |  |  |  |  | $ (129)
Stock tendered for payments of withholding taxes (in shares) |  |  |  |  |  |  | (3,168)
Issuance of restricted stock awards, net of forfeitures |  |  | 1,383 |  |  |  | $ (1,383)
Issuance of restricted stock awards, net of forfeitures (in shares) |  |  |  |  |  |  | (32,735)
Share-based compensation expense | 3,747 |  | 3,747 |  |  |  |
Net income | 26,105 |  |  |  | 26,105 |  |
Foreign currency translation adjustment | (33) |  |  |  |  | (33) |
Ending Balance at Sep. 30, 2019 | $ 1,044,556 | $ 419 | $ 175,749 | $ (15,458) | $ 1,151,646 | $ (211) | $ (267,589)
Ending Balance (in shares) at Sep. 30, 2019 |  | 41,887,088 |  |  |  |  | (7,849,464)

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