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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, 2016 $ 338 $ 513,531 $ 331,311 $ (2,381) $ 842,799
Beginning balace (in shares) at Dec. 31, 2016 34,023,850        
Net Income     54,789   54,789
Other comprehensive gain, net of tax       1,260 1,260
Stock-based compensation expense   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 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) (16,734)        
Time based 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 (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        
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       34,185,163
Net Income     73,011   $ 73,011
Other comprehensive gain, net of tax       (4,185) (4,185)
Stock-based compensation expense   3,143     3,143
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) (13,361)        
Time based stock awards granted (in shares) 94,344        
Issuance of common stock related to employee stock purchase plan   392     392
Issuance of common stock related to employee stock purchase plan (in shares) 6,695        
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from AOCI (ASU 2018-02)     674 (674)  
Ending balance at Jun. 30, 2018 $ 341 $ 524,176 $ 505,229 $ (6,609) $ 1,023,137
Ending balance (in shares) at Jun. 30, 2018 34,305,071       34,305,071