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Consolidated Statements of Stockholders' Equity - 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, 2014 $ 91 $ 414,394 $ (862,608) $ (51,521) $ 1,442,082 $ 942,438
Stockholders' Equity [Roll Forward]            
Net income 0 0 0 0 133,046 133,046
Other comprehensive income, net of tax 0 0 0 (19,748) 0 (19,748)
Repurchase of Class A common stock (Note 12) 0 0 (164,094) 0 0 (164,094)
Exercise of employee stock options/vesting of stock awards 0 (6,324) 9,639 0 0 3,315
Excess tax benefit from equity awards 0 4,451 0 0 0 4,451
Stock-based compensation 0 7,400 0 0 0 7,400
Cash dividends 0 0 0 0 (81,187) (81,187)
Balance at end of period at Dec. 31, 2015 91 419,921 (1,017,063) (71,269) 1,493,941 825,621
Stockholders' Equity [Roll Forward]            
Net income 0 0 0 0 143,086 143,086
Other comprehensive income, net of tax 0 0 0 (12,853) 0 (12,853)
Repurchase of Class A common stock (Note 12) 0 0 (247,208) 0 0 (247,208)
Exercise of employee stock options/vesting of stock awards 0 159 14,148 0 0 14,307
Excess tax benefit from equity awards 0 3,840 0 0 0 3,840
Stock-based compensation 0 8,890 0 0 0 8,890
Equity component of convertible note issuance (net) 0 6,825 0 0 0 6,825
Cash dividends 0 0 0 0 (78,438) (78,438)
Balance at end of period at Dec. 31, 2016 91 439,635 (1,250,123) (84,122) 1,558,589 664,070
Stockholders' Equity [Roll Forward]            
Cumulative effect adjustment from adoption of ASU 2016-09 | Accounting Standards Update 2016-09 [Member] 0 2,800 0 0 (2,800) 0
Net income 0 0 0 0 129,437 129,437
Other comprehensive income, net of tax 0 0 0 17,804 0 17,804
Repurchase of Class A common stock (Note 12) 0 0 (71,731) 0 0 (71,731)
Exercise of employee stock options/vesting of stock awards 0 9,479 14,964 0 0 24,443
Stock-based compensation 0 19,314 0 0 0 19,314
Acquisition of noncontrolling interests 0 (11,067) 0 0 0 (11,067)
Acquisition of equity method investment (0.2 million shares) 0 6,188 2,196 0 0 8,384
Cash dividends 0 0 0 0 (76,058) (76,058)
Balance at end of period at Dec. 31, 2017 $ 91 $ 466,349 $ (1,304,694) $ (66,318) $ 1,609,168 $ 704,596