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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 |  |  |  | 71,990 |  | 71,990
Other comprehensive income (loss) |  |  |  |  | (1,131) | (1,131)
Stock-based compensation expense |  |  | 5,159 |  |  | 5,159
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes |  |  | 282 |  |  | 282
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) | 23,614 |  |  |  |  |
Excess tax benefits from stock compensation |  |  | 166 |  |  | 166
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes | $ 2 |  | (2) |  |  |
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) | (17,556) |  |  |  |  |
Time based stock awards granted (in shares) | 104,775 |  |  |  |  |
Issuance of common stock related to employee stock purchase plan |  |  | 572 |  |  | 572
Issuance of common stock related to employee stock purchase plan (in shares) | 12,154 |  |  |  |  |
Ending balance at Sep. 30, 2016 | $ 333 | 946 | 509,706 | 305,594 | (940) | $ 815,639
Ending balance (in shares) at Sep. 30, 2016 | 33,590,880 |  |  |  |  | 33,590,880
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 |  |  |  | 84,663 |  | $ 84,663
Other comprehensive income (loss) |  |  |  |  | 1,432 | 1,432
Stock-based compensation expense |  |  | 4,198 | 1 |  | 4,199
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes | $ 1 |  | 258 |  |  | 259
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) | 60,925 |  |  |  |  |
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes | $ 1 |  | (2) |  |  | (1)
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) | (16,962) |  |  |  |  |
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares) | 3,589 |  |  |  |  |
Time based stock awards granted (in shares) | 91,097 |  |  |  |  |
Issuance of common stock related to employee stock purchase plan |  |  | 631 |  |  | 631
Issuance of common stock related to employee stock purchase plan (in shares) | 11,510 |  |  |  |  |
Ending balance at Sep. 30, 2017 | $ 340 |  | $ 518,616 | $ 415,975 | $ (949) | $ 933,982
Ending balance (in shares) at Sep. 30, 2017 | 34,174,009 |  |  |  |  | 34,174,009

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