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v3.10.0.1

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Common Stock [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 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income |  |  |  | 97,707 |  | 97,707
Other comprehensive gain (loss), net of tax |  |  |  |  | (2,572) | (2,572)
Stock-based compensation expense |  |  | 6,907 |  |  | 6,907
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes | $ 1 |  | 954 |  |  | 955
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) | 74,215 |  |  |  |  |
Excess tax benefits realized from stock compensation |  |  | 400 |  |  | 400
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) | (18,490) |  |  |  |  |
Time based stock awards granted (in shares) | 104,775 |  |  |  |  |
Issuance of common stock related to employee stock purchase plan |  |  | 801 |  |  | 801
Issuance of common stock related to employee stock purchase plan (in shares) | 16,962 |  |  |  |  |
Issuance of common stock in full redemption of warrants | $ 4 | $ (946) | 942 |  |  |
Issuance of common stock in full redemption of warrants (in shares) | 378,495 |  |  |  |  |
Ending balance at Dec. 31, 2016 | $ 338 |  | 513,531 | 331,311 | (2,381) | 842,799
Ending balance (in shares) at Dec. 31, 2016 | 34,023,850 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income |  |  |  | 100,232 |  | 100,232
Other comprehensive gain (loss), net of tax |  |  |  |  | 631 | 631
Stock-based compensation expense |  |  | 5,568 |  |  | 5,568
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes | $ 1 |  | 371 |  |  | 372
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) | 69,040 |  |  |  |  |
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) | (17,801) |  |  |  |  |
Time based stock awards granted (in shares) | 91,097 |  |  |  |  |
Issuance of common stock related to employee stock purchase plan | $ (1) |  | 836 | 1 |  | 836
Issuance of common stock related to employee stock purchase plan (in shares) | 14,684 |  |  |  |  |
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares) | 4,293 |  |  |  |  |
Ending balance at Dec. 31, 2017 | $ 340 |  | 520,304 | 431,544 | (1,750) | $ 950,438
Ending balance (in shares) at Dec. 31, 2017 | 34,185,163 |  |  |  |  | 34,185,163
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income |  |  |  | 152,276 |  | $ 152,276
Other comprehensive gain (loss), net of tax |  |  |  |  | (1,851) | (2,525)
Stock-based compensation expense |  |  | 6,494 |  |  | 6,494
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes | $ 1 |  | 775 |  |  | 776
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) | 108,201 |  |  |  |  |
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) | (14,162) |  |  |  |  |
Time based stock awards granted (in shares) | 94,344 |  |  |  |  |
Issuance of common stock related to employee stock purchase plan |  |  | 808 |  |  | 808
Issuance of common stock related to employee stock purchase plan (in shares) | 14,373 |  |  |  |  |
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from AOCI (ASU 2018-02) |  |  |  | 674 | (674) |
Ending balance at Dec. 31, 2018 | $ 342 |  | $ 528,380 | $ 584,494 | $ (4,275) | $ 1,108,941
Ending balance (in shares) at Dec. 31, 2018 | 34,387,919 |  |  |  |  | 34,387,919

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