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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, 2012 | $ 91 | $ 317,293 | $ (714,853) | $ (51,822) | $ 1,039,903 | $ 590,612 |
Stockholders' equity [Roll Forward] |  |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 364,888 | 364,888 |
Other comprehensive income, net of tax | 0 | 0 | 0 | 5,594 | 0 | 5,594 |
Repurchase of Class A common stock (Note 11) | 0 | 0 | (140,865) | 0 | 0 | (140,865) | $ (140,865)
Exercise of employee stock options/vesting of stock awards | 0 | 5,556 | 28,814 | 0 | 0 | 34,370 |
Excess tax benefit from equity awards | 0 | 41,914 | 0 | 0 | 0 | 41,914 |
Stock-based compensation | 0 | 32,620 | 0 | 0 | 0 | 32,620 |
Cash dividends | 0 | 0 | 0 | 0 | (70,514) | (70,514) |
Balance at end 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) | $ (164,100)
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 |

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