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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

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