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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Common Stock [Member] Class A [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Loss [Member] | Retained Earnings [Member] | Total | Cumulative Effect Adjustment [Member] Common Stock [Member] Class A [Member] | Cumulative Effect Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect Adjustment [Member] Treasury Stock [Member] | Cumulative Effect Adjustment [Member] Accumulated Other Comprehensive Loss [Member] | Cumulative Effect Adjustment [Member] Retained Earnings [Member] | Cumulative Effect Adjustment [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2018 | $ 91 | $ 552,564 | $ (1,326,605) | $ (79,934) | $ 1,635,751 | $ 781,867 |  |  |  |  |  |
Balance at beginning of period (ASC 842 [Member]) at Dec. 31, 2018 |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 657 | $ 657
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 133,441 | 133,441 |  |  |  |  |  |
Other comprehensive (loss) income, net of tax | 0 | 0 | 0 | (15,027) | 0 | (15,027) |  |  |  |  |  |
Repurchase of Class A common stock (Note 6) | 0 | 0 | (825) | 0 | 0 | (825) |  |  |  |  |  |
Exercise of employee stock options/vesting of stock awards | 0 | (4,930) | 2,604 | 0 | 0 | (2,326) |  |  |  |  |  |
Stock-based compensation | 0 | 9,649 | 0 | 0 | 0 | 9,649 |  |  |  |  |  |
Cash dividends | 0 | 0 | 0 | 0 | (61,636) | (61,636) |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | 91 | 557,283 | (1,324,826) | (94,961) | 1,708,213 | 845,800 |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2019 | 91 | 556,294 | (1,324,834) | (81,276) | 1,684,675 | 834,950 |  |  |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 44,090 | 44,090 |  |  |  |  |  |
Other comprehensive (loss) income, net of tax | 0 | 0 | 0 | (13,685) | 0 | (13,685) |  |  |  |  |  |
Repurchase of Class A common stock (Note 6) | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |
Exercise of employee stock options/vesting of stock awards | 0 | (26) | 8 | 0 | 0 | (18) |  |  |  |  |  |
Stock-based compensation | 0 | 1,015 | 0 | 0 | 0 | 1,015 |  |  |  |  |  |
Cash dividends | 0 | 0 | 0 | 0 | (20,552) | (20,552) |  |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | 91 | 557,283 | (1,324,826) | (94,961) | 1,708,213 | 845,800 |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | 91 | 557,544 | (1,324,826) | (85,292) | 1,727,772 | 875,289 |  |  |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 117,888 | 117,888 |  |  |  |  |  |
Other comprehensive (loss) income, net of tax | 0 | 0 | 0 | 2,184 | 0 | 2,184 |  |  |  |  |  |
Repurchase of Class A common stock (Note 6) | 0 | 0 | (127,361) | 0 | 0 | (127,361) |  |  |  |  |  |
Exercise of employee stock options/vesting of stock awards | 0 | (2,492) | 5,813 | 0 | 0 | 3,321 |  |  |  |  |  |
Stock-based compensation | 0 | 15,439 | 0 | 0 | 0 | 15,439 |  |  |  |  |  |
Cash dividends | 0 | 0 | 0 | 0 | (59,287) | (59,287) |  |  |  |  |  |
Balance at end of period at Sep. 30, 2020 | 91 | 570,491 | (1,446,374) | (83,108) | 1,786,373 | 827,473 |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2020 | 91 | 563,115 | (1,427,064) | (93,441) | 1,749,311 | 792,012 |  |  |  |  |  |
Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 56,307 | 56,307 |  |  |  |  |  |
Other comprehensive (loss) income, net of tax | 0 | 0 | 0 | 10,333 | 0 | 10,333 |  |  |  |  |  |
Repurchase of Class A common stock (Note 6) | 0 | 0 | (19,994) | 0 | 0 | (19,994) |  |  |  |  |  |
Exercise of employee stock options/vesting of stock awards | 0 | 261 | 684 | 0 | 0 | 945 |  |  |  |  |  |
Stock-based compensation | 0 | 7,115 | 0 | 0 | 0 | 7,115 |  |  |  |  |  |
Cash dividends | 0 | 0 | 0 | 0 | (19,245) | (19,245) |  |  |  |  |  |
Balance at end of period at Sep. 30, 2020 | $ 91 | $ 570,491 | $ (1,446,374) | $ (83,108) | $ 1,786,373 | $ 827,473 |  |  |  |  |  |

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