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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
Class A [Member]
Balance at beginning of period at Dec. 31, 2013 $ 91 $ 397,383 $ (826,904) $ (46,228) $ 1,334,277 $ 858,619  
Stockholders' Equity [Roll Forward]              
Net income 0 0 0 0 189,176 189,176  
Other comprehensive income, net of tax 0 0 0 (5,293) 0 (5,293)  
Repurchase of Class A common stock (Note 11) 0 0 (45,724) 0 0 (45,724) $ (45,724)
Exercise of employee stock options/vesting of stock awards 0 (12,440) 10,020 0 0 (2,420)  
Excess tax benefit from equity awards 0 11,947 0 0 0 11,947  
Stock-based compensation 0 17,504 0 0 0 17,504  
Cash dividends 0 0 0 0 (81,371) (81,371)  
Balance at end 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 11) 0 0 (164,094) 0 0 (164,094) (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 11) 0 0 (247,208) 0 0 (247,208) $ (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