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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | COMMON STOCK | CAPITAL SURPLUS | ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME | RETAINED EARNINGS
--- | --- | --- | --- | --- | ---
Balance at beginning of period, (in shares) at Dec. 31, 2015 |  | 131,156 |  |  |
Balance at beginning 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 |  |  | 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 ($1.12 per share, $.96 per share and $.88 per share) |  |  |  |  | (114,514)
Balance at end of period, (in shares) at Dec. 31, 2016 |  | 127,797 |  |  |
Balance at end of period at Dec. 31, 2016 |  | $ 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 |  |
Foreign currency translation adjustments, net of tax | 24,009 |  |  | 24,009 |
Net income | 290,584 |  |  |  | 290,584
Cash dividends ($1.12 per share, $.96 per share and $.88 per share) |  |  |  |  | (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
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock, (in shares) |  | 666 |  |  |
Net issuances of restricted stock |  | $ 1 | (1) |  |
Repurchases of common stock, (in shares) |  | (5,849) |  |  |
Repurchases of common stock |  | $ (6) |  |  | (364,862)
Stock-based compensation expense |  |  | 44,953 |  |
Foreign currency translation adjustments, net of tax | (19,616) |  |  | (19,616) |
Net income | 434,288 |  |  |  | 434,288
Cash dividends ($1.12 per share, $.96 per share and $.88 per share) |  |  | (30,365) |  | (106,459)
Balance at end of period, (in shares) at Dec. 31, 2018 |  | 119,078 |  |  |
Balance at end of period at Dec. 31, 2018 | $ 1,063,198 | $ 119 | $ 1,079,188 | $ (16,109) | $ 0

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