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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
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 61,581 61,581
Other comprehensive (loss) income, net of tax 0 0 0 (8,149) 0 (8,149)
Repurchase of Class A common stock (Note 6) 0 0 (107,367) 0 0 (107,367)
Exercise of employee stock options/vesting of stock awards 0 (2,753) 5,129 0 0 2,376
Stock-based compensation 0 8,324 0 0 0 8,324
Cash dividends 0 0 0 0 (40,042) (40,042)
Balance at end of period at Jun. 30, 2020 91 563,115 (1,427,064) (93,441) 1,749,311 792,012
Balance at beginning of period at Mar. 31, 2020 91 557,916 (1,384,036) (100,289) 1,726,816 800,498
Stockholders' Equity [Roll Forward]            
Net income 0 0 0 0 41,851 41,851
Other comprehensive (loss) income, net of tax 0 0 0 6,848 0 6,848
Repurchase of Class A common stock (Note 6) 0 0 (46,481) 0 0 (46,481)
Exercise of employee stock options/vesting of stock awards 0 330 3,453 0 0 3,783
Stock-based compensation 0 4,869 0 0 0 4,869
Cash dividends 0 0 0 0 (19,356) (19,356)
Balance at end of period at Jun. 30, 2020 91 563,115 (1,427,064) (93,441) 1,749,311 792,012
Balance at beginning of period at Dec. 31, 2020 91 579,801 (1,461,593) (64,768) 1,840,740 894,271
Stockholders' Equity [Roll Forward]            
Net income 0 0 0 0 106,768 106,768
Other comprehensive (loss) income, net of tax 0 0 0 (3,785) 0 (3,785)
Repurchase of Class A common stock (Note 6) 0 0 (60,410) 0 0 (60,410)
Exercise of employee stock options/vesting of stock awards 0 (6,208) 12,136 0 0 5,928
Stock-based compensation 0 13,383 0 0 0 13,383
Cash dividends 0 0 0 0 (38,329) (38,329)
Balance at end of period at Jun. 30, 2021 91 586,976 (1,509,867) (68,553) 1,909,179 917,826
Balance at beginning of period at Mar. 31, 2021 91 579,204 (1,505,076) (71,626) 1,868,881 871,474
Stockholders' Equity [Roll Forward]            
Net income 0 0 0 0 59,338 59,338
Other comprehensive (loss) income, net of tax 0 0 0 3,073 0 3,073
Repurchase of Class A common stock (Note 6) 0 0 (10,004) 0 0 (10,004)
Exercise of employee stock options/vesting of stock awards 0 1,192 5,213 0 0 6,405
Stock-based compensation 0 6,580 0 0 0 6,580
Cash dividends 0 0 0 0 (19,040) (19,040)
Balance at end of period at Jun. 30, 2021 $ 91 $ 586,976 $ (1,509,867) $ (68,553) $ 1,909,179 $ 917,826