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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     84,663   84,663
Other comprehensive gain, net of tax       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)        
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        
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares) 3,589        
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        
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     111,959   $ 111,959
Other comprehensive gain, net of tax       (6,866) (6,866)
Stock-based compensation expense   5,174     5,174
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) (13,681)        
Time based stock awards granted (in shares) 94,344        
Issuance of common stock related to employee stock purchase plan   608     608
Issuance of common stock related to employee stock purchase plan (in shares) 10,417        
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from AOCI (ASU 2018-02)     674 (674)  
Ending balance at Sep. 30, 2018 $ 341 $ 526,423 $ 544,177 $ (9,290) $ 1,061,651
Ending balance (in shares) at Sep. 30, 2018 34,308,473       34,185,163