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v3.8.0.1

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 476,232 | $ 497 | $ (53,770) | $ 158,549 | $ (35) | $ 370,991
Beginning Balance, Shares at Dec. 31, 2014 |  | 49,746 | 3,002 |  |  |
Comprehensive income | 130,957 |  |  |  | (454) | 131,411
Common stock purchased for treasury | (11,279) |  | $ (11,279) |  |  |
Common stock purchased for treasury, shares |  |  | 288 |  |  |
Share-based compensation | 6,989 | $ 3 | $ (4,283) | 11,269 |  |
Share-based compensation, Shares |  | 324 | 94 |  |  |
Restricted shares forfeited | 0 | $ 0 | $ 0 | 0 | 0 | 0
Restricted shares forfeited, Shares |  |  | 27 |  |  |
Exercise of stock options | $ 3,489 | $ 3 |  | 3,486 |  |
Exercise of stock options, Shares | 218 | 218 |  |  |  |
Excess tax benefits | $ 3,863 |  |  | 3,863 |  |
Ending Balance at Dec. 31, 2015 | 610,251 | $ 503 | $ (69,332) | 177,167 | (489) | 502,402
Ending Balance, Shares at Dec. 31, 2015 |  | 50,288 | 3,411 |  |  |
Comprehensive income | 148,093 |  |  |  | (421) | 148,514
Common stock purchased for treasury | (15,367) |  | $ (15,367) |  |  |
Common stock purchased for treasury, shares |  |  | 416 |  |  |
Share-based compensation | 7,581 | $ 3 | $ (4,695) | 12,273 |  |
Share-based compensation, Shares |  | 275 | 114 |  |  |
Restricted shares forfeited | 0 | $ 0 | $ 0 | 0 | 0 | 0
Restricted shares forfeited, Shares |  |  | 9 |  |  |
Exercise of stock options | $ 13,207 | $ 9 |  | 13,198 |  |
Exercise of stock options, Shares | 946 | 946 |  |  |  |
Excess tax benefits | $ 9,921 |  |  | 9,921 |  |
Ending Balance at Dec. 31, 2016 | 773,686 | $ 515 | $ (89,394) | 212,559 | (910) | 650,916
Ending Balance, Shares at Dec. 31, 2016 |  | 51,509 | 3,950 |  |  |
Comprehensive income | 203,505 |  |  |  | 186 | 203,319
Common stock purchased for treasury | $ (1,510) |  | $ (1,510) |  |  |
Common stock purchased for treasury, shares | 17 |  | 17 |  |  |
Share-based compensation | $ 2,898 | $ 2 | $ (9,790) | 12,686 |  |
Share-based compensation, Shares |  | 192 | 151 |  |  |
Restricted shares forfeited | 0 | $ 0 | $ 0 | 0 | 0 | 0
Restricted shares forfeited, Shares |  |  | 34 |  |  |
Exercise of stock options | $ 7,372 | $ 6 |  | 7,366 |  |
Exercise of stock options, Shares | 576 | 576 |  |  |  |
Ending Balance at Dec. 31, 2017 | $ 985,951 | $ 523 | $ (100,694) | 232,670 | $ (724) | 854,176
Ending Balance, Shares at Dec. 31, 2017 |  | 52,277 | 4,152 |  |  |
Cumulative effect from the adoption of accounting pronouncements, net of taxes |  |  |  | $ 59 |  | $ (59)

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