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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
Beginning balance, value at Dec. 31, 2014 | $ 74,138 | $ 538 | $ 67,937 | $ 5,663 |
Beginning balance, shares at Dec. 31, 2014 |  | 53,832,782 |  |  |
Vesting of restricted stock |  | $ 33 | (33) |  |
Vesting of restricted stock, shares |  | 3,287,091 |  |  |
Stock-based compensation | 3,231 |  | 3,231 |  |
Net income | 20,945 |  |  | 20,945 |
Ending balance, value at Dec. 31, 2015 | 98,314 | $ 571 | 71,135 | 26,608 |
Ending balance, shares at Dec. 31, 2015 |  | 57,119,873 |  |  |
Vesting of restricted stock |  | $ 14 | (14) |  |
Vesting of restricted stock, shares |  | 1,333,410 |  |  |
Stock-based compensation | 24,331 |  | 24,331 |  |
Repurchases of common stock | (49,958) |  |  |  | $ (49,958)
Repurchases of common stock, shares |  |  |  |  | 1,122,261
Net income | 43,840 |  |  | 43,840 |
Ending balance, value at Dec. 31, 2016 | 116,527 | $ 585 | 95,452 | 70,448 | $ (49,958)
Ending balance, shares at Dec. 31, 2016 |  | 58,453,283 |  |  | 1,122,261
Vesting of restricted stock |  | $ 16 | (16) |  |
Vesting of restricted stock, shares |  | 1,696,128 |  |  |
Stock-based compensation | 41,798 |  | 41,798 |  |
Repurchases of common stock | (89,730) |  |  |  | $ (89,730)
Repurchases of common stock, shares |  |  |  |  | 1,238,577
Net income | 66,807 |  |  | 66,807 |
Ending balance, value at Dec. 31, 2017 | $ 135,402 | $ 601 | $ 137,234 | $ 137,255 | $ (139,688)
Ending balance, shares at Dec. 31, 2017 |  | 60,149,411 |  |  | 2,360,838

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