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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
--- | --- | --- | --- | --- | ---
Beginning balace at Dec. 31, 2017 | $ 340 | $ 520,304 | $ 431,544 | $ (1,750) | $ 950,438
Beginning balace (in shares) at Dec. 31, 2017 | 34,185,163 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income |  |  | 35,715 |  | 35,715
Other comprehensive income, net of tax |  |  |  | (2,986) | (2,986)
Stock-based compensation expense |  | 1,476 |  |  | 1,476
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes |  | 338 |  |  | 338
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) | 32,230 |  |  |  |
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes | $ 1 | (1) |  |  |
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) | (12,106) |  |  |  |
Time based stock awards granted (in shares) | 94,344 |  |  |  |
Issuance of common stock related to employee stock purchase plan |  | 199 |  |  | 199
Issuance of common stock related to employee stock purchase plan (in shares) | 3,425 |  |  |  |
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from AOCI (ASU 2018-02) |  |  | 674 | (674) |
Ending balance at Mar. 31, 2018 | $ 341 | 522,316 | 467,933 | (5,410) | 985,180
Ending balance (in shares) at Mar. 31, 2018 | 34,303,056 |  |  |  |
Beginning balace at Dec. 31, 2018 | $ 342 | 528,380 | 584,494 | (4,275) | $ 1,108,941
Beginning balace (in shares) at Dec. 31, 2018 | 34,387,919 |  |  |  | 34,387,919
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income |  |  | 33,749 |  | $ 33,749
Other comprehensive income, net of tax |  |  |  | 3,283 | 3,283
Stock-based compensation expense |  | 2,029 |  |  | 2,029
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes |  | 296 |  |  | 296
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) | 26,034 |  |  |  |
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes | $ 1 | (1) |  |  |
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) | (10,944) |  |  |  |
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares) | 17,655 |  |  |  |
Time based stock awards granted (in shares) | 112,636 |  |  |  |
Issuance of common stock related to employee stock purchase plan |  | 190 |  |  | 190
Issuance of common stock related to employee stock purchase plan (in shares) | 3,893 |  |  |  |
Ending balance at Mar. 31, 2019 | $ 343 | $ 530,894 | $ 618,243 | $ (992) | $ 1,148,488
Ending balance (in shares) at Mar. 31, 2019 | 34,537,193 |  |  |  | 34,537,193

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