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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands | Common Stock | Treasury Stock at Cost | Additional Paid-in Capital | Retained Earnings | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 377 |  | $ 838,976 | $ 76,376 | $ 915,729
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  |  | 72,606 | 72,606
Separation-related adjustments |  |  | 664 |  | 664
Share-based compensation |  |  | 7,669 |  | 7,669
Issuance of restricted share awards under long-term equity incentive plan | 8 |  | (8) |  |
Repurchase of shares of common stock pursuant to Share Repurchase Program |  | $ (22,296) |  |  | (22,296)
Shares of common stock withheld to pay taxes on employees’ equity awards |  |  | (1,825) |  | (1,825)
Balance at Dec. 31, 2016 | 385 | (22,296) | 845,476 | 148,982 | 972,547
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  |  | 158,133 | 158,133
Share-based compensation |  |  | 9,889 |  | 9,889
Issuance of restricted share awards under long-term equity incentive plan | 1 |  | (1) |  |
Repurchase of shares of common stock pursuant to Share Repurchase Program |  | (39,286) |  |  | (39,286)
Repurchase of shares of common stock pursuant to Accelerated Share Repurchase Program |  | (80,000) | (20,000) |  | (100,000)
Shares of common stock withheld to pay taxes on employees’ equity awards |  |  | (4,764) |  | (4,764)
Balance at Dec. 31, 2017 | 386 | (141,582) | 830,600 | 307,115 | 996,519
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  |  | 134,752 | 134,752
Share-based compensation |  |  | 11,317 |  | 11,317
Issuance of restricted share awards under long-term equity incentive plan | 1 |  | (1) |  |
Repurchase of shares of common stock pursuant to Share Repurchase Program |  | (15,000) |  |  | (15,000)
Repurchase of shares of common stock pursuant to the settlement of Accelerated Share Repurchase Program |  | (20,000) | 20,000 |  |
Repurchase of shares of common stock pursuant to Accelerated Share Repurchase Program |  | (40,025) | (10,000) |  | (50,025)
Shares of common stock withheld to pay taxes on employees’ equity awards |  |  | (5,465) |  | (5,465)
Balance at Dec. 31, 2018 | $ 387 | $ (216,607) | $ 846,451 | $ 441,867 | $ 1,072,098

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