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Consolidated Statements of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2018 - 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, 2017 | $ 985,951 | $ 523 | $ (100,694) | $ 232,670 | $ (724) | $ 854,176
Beginning Balance, Shares at Dec. 31, 2017 |  | 52,277 | 4,152 |  |  |
Comprehensive income | 153,708 |  |  |  | 228 | 153,480
Adoption impact - ASU 2018-02 | Accounting Standards Update 2018-02 [Member] |  |  |  |  | (156) | 156
Common stock purchased for treasury | (4,135) |  | $ (4,135) |  |  |
Common stock purchased for treasury, shares |  |  | 39 |  |  |
Restricted shares forfeited | 0 | $ 0 | $ 0 | 0 | 0 | 0
Restricted shares forfeited, Shares |  |  | 94 |  |  |
Share-based compensation | 1,913 | $ 2 | $ (15,153) | 17,064 |  |
Share-based compensation, Shares |  | 163 | 151 |  |  |
Exercise of stock options | $ 2,095 | $ 1 |  | 2,094 |  |
Exercise of stock options, Shares | 130 | 130 |  |  |  |
Ending Balance at Sep. 30, 2018 | $ 1,138,358 | $ 526 | $ (119,982) | $ 251,828 | $ (652) | 1,006,638
Ending Balance, Shares at Sep. 30, 2018 |  | 52,570 | 4,436 |  |  |
Cumulative effect from the adoption of accounting pronouncements, net of taxes | $ (1,174) |  |  |  |  | $ (1,174)

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