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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

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- Definition The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591552-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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