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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | COMMON STOCK | CAPITAL SURPLUS | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | RETAINED EARNINGS
--- | --- | --- | --- | --- | ---
Balance at beginning of period, (in shares) at Dec. 31, 2014 |  | 135,134 |  |  |
Balance at beginning of period at Dec. 31, 2014 |  | $ 135 | $ 928,157 | $ 14,730 | $ 36,836
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock, (in shares) |  | 785 |  |  |
Net issuances of restricted stock |  | $ 1 | (1) |  |
Repurchases of common stock, (in shares) |  | (4,817) |  |  |
Repurchases of common stock |  | $ (5) |  |  | (252,916)
Stock-based compensation expense |  |  | 41,292 |  |
Exercises of stock options, (in shares) | 54 | 54 |  |  |
Exercises of stock options |  | $ 0 | 1,529 |  |
Tax impact of equity incentive plans |  |  | 8,500 |  |
Foreign currency translation adjustments, net of tax | $ (25,024) |  |  | (25,024) |
Net income | $ 357,796 |  |  |  | 357,796
Cash dividends |  |  |  |  | (107,249)
Balance at end of period, (in shares) at Dec. 31, 2015 |  | 131,156 |  |  |
Balance at end of period at Dec. 31, 2015 |  | $ 131 | 979,477 | (10,294) | 34,467
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock, (in shares) |  | 1,039 |  |  |
Net issuances of restricted stock |  | $ 1 | (1) |  |
Repurchases of common stock, (in shares) |  | (4,405) |  |  |
Repurchases of common stock |  | $ (4) |  |  | (178,780)
Stock-based compensation expense |  |  | 42,699 |  |
Exercises of stock options, (in shares) | 7 | 7 |  |  |
Exercises of stock options |  | $ 0 | 223 |  |
Tax impact of equity incentive plans |  |  | 13 |  |
Foreign currency translation adjustments, net of tax | $ (10,208) |  |  | (10,208) |
Net income | 343,389 |  |  |  | 343,389
Cash dividends |  |  |  |  | (114,514)
Balance at end of period, (in shares) at Dec. 31, 2016 |  | 127,797 |  |  |
Balance at end of period at Dec. 31, 2016 | $ 1,086,599 | $ 128 | 1,022,411 | (20,502) | 84,562
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock, (in shares) |  | 918 |  |  |
Net issuances of restricted stock |  | $ 1 | (1) |  |
Repurchases of common stock, (in shares) |  | (4,454) |  |  |
Repurchases of common stock |  | $ (5) |  |  | (217,031)
Stock-based compensation expense |  |  | 42,191 |  |
Exercises of stock options, (in shares) | 0 | 0 |  |  |
Exercises of stock options |  | $ 0 | 0 |  |
Tax impact of equity incentive plans |  |  | 0 |  |
Foreign currency translation adjustments, net of tax | $ 24,009 |  |  | 24,009 |
Net income | 290,584 |  |  |  | 290,584
Cash dividends |  |  |  |  | (121,082)
Balance at end of period, (in shares) at Dec. 31, 2017 |  | 124,261 |  |  |
Balance at end of period at Dec. 31, 2017 | $ 1,105,265 | $ 124 | $ 1,064,601 | $ 3,507 | $ 37,033

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