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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands | Common [Member] | Warrant [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Beginning balace at Dec. 31, 2015 | $ 331 | $ 946 | $ 503,529 | $ 233,604 | $ 191 | $ 738,601
Beginning balace (in shares) at Dec. 31, 2015 | 33,467,893 |  |  |  |  |
Net Income |  |  |  | 47,467 |  | 47,467
Other comprehensive income (loss) |  |  |  |  | (1,515) | (1,515)
Stock-based compensation |  |  | 3,312 |  |  | 3,312
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes |  |  | 252 |  |  | 252
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) | 21,825 |  |  |  |  |
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes | $ 2 |  | (2) |  |  |
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) | (17,485) |  |  |  |  |
Restricted stock awards granted |  |  |  |  |  |
Restricted stock awards granted (in shares) | 104,775 |  |  |  |  |
Issuance of common stock related to employee stock purchase plan |  |  | 371 |  |  | 371
Issuance of common stock related to employee stock purchase plan (in shares) | 7,890 |  |  |  |  |
Tax benefits realized from stock compensation |  |  | 140 |  |  | 140
Ending balance at Jun. 30, 2016 | $ 333 | 946 | 507,602 | 281,071 | (1,324) | $ 788,628
Ending balance (in shares) at Jun. 30, 2016 | 33,584,898 |  |  |  |  | 33,584,898
Beginning balace at Dec. 31, 2016 | $ 338 |  | 513,531 | 331,311 | (2,381) | $ 842,799
Beginning balace (in shares) at Dec. 31, 2016 | 34,023,850 |  |  |  |  | 34,023,850
Net Income |  |  |  | 54,789 |  | $ 54,789
Other comprehensive income (loss) |  |  |  |  | 1,260 | 1,260
Stock-based compensation |  |  | 3,169 |  |  | 3,169
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes | $ 1 |  | 256 |  |  | 257
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) | 60,595 |  |  |  |  |
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes | $ 1 |  | (2) |  |  | (1)
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) | (16,734) |  |  |  |  |
Restricted stock awards granted |  |  |  |  |  |
Restricted stock awards granted (in shares) | 91,097 |  |  |  |  |
Issuance of common stock related to employee stock purchase plan |  |  | 402 |  |  | 402
Issuance of common stock related to employee stock purchase plan (in shares) | 7,527 |  |  |  |  |
Vesting of performance based stock awards, net of shares withheld for payroll taxes |  |  |  |  |  |
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares) | 3,589 |  |  |  |  |
Ending balance at Jun. 30, 2017 | $ 340 |  | $ 517,356 | $ 386,100 | $ (1,121) | $ 902,675
Ending balance (in shares) at Jun. 30, 2017 | 34,169,924 |  |  |  |  | 34,169,924

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