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Consolidated Statements of Stockholder's Equity and Comprehensive Income (USD $)
In Thousands, unless otherwise specified
Common Class A [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Total
Balance at beginning of period at Dec. 31, 2009 $ 91 $ 232,219 $ (433,567) $ (68,134) $ 645,078 $ 375,687
Stockholders' equity [Roll Forward]            
Net income 0 0 0 0   136,051
Total comprehensive income 0 0 0 9,595 0 9,595
Repurchase of Class A common stock (Note 11) 0 0 (58,516) 0 0 (58,516)
Reclassification of treasury shares held by subsidiary 0 3,122 (3,122) 0 0 0
Exercise of employee stock options 0 2,724 18,457 0 0 21,181
Excess tax benefit from equity awards 0 7,605 0 0 0 7,605
Stock-based compensation 0 10,835 0 0 0 10,835
Cash dividends 0 0 0 0 (31,189) (31,189)
Balance at end of period at Dec. 31, 2010 91 256,505 (476,748) (58,539) 749,940 471,249
Stockholders' equity [Roll Forward]            
Net income 0 0 0 0 153,330 153,330
Total comprehensive income 0 0 0 (4,026) 0 (4,026)
Repurchase of Class A common stock (Note 11) 0 0 (67,149) 0 0 (67,149)
Exercise of employee stock options 0 7,978 21,735 0 0 29,713
Excess tax benefit from equity awards 0 12,657 0 0 0 12,657
Stock-based compensation 0 15,100 0 0 0 15,100
Cash dividends 0 0 0 0 (36,638) (36,638)
Balance at end of period at Dec. 31, 2011 91 292,240 (522,162) (62,565) 866,632 574,236
Stockholders' equity [Roll Forward]            
Net income 0 0 0 0 221,645 221,645
Total comprehensive income 0 0 0 10,743 0 10,743
Repurchase of Class A common stock (Note 11) 0 0 (201,471) 0 0 (201,471)
Exercise of employee stock options 0 (4,214) 8,780 0 0 4,566
Excess tax benefit from equity awards 0 7,909 0 0 0 7,909
Stock-based compensation 0 21,358 0 0 0 21,358
Cash dividends 0 0 0 0 (48,374) (48,374)
Balance at end of period at Dec. 31, 2012 $ 91 $ 317,293 $ (714,853) $ (51,822) $ 1,039,903 $ 590,612