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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]
AOCI Attributable to Parent [Member]
Total
Beginning balance, value at Dec. 31, 2017 $ 340 $ 520,304 $ 431,544 $ (1,750) $ 950,438
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2017 34,185,163        
Net Income 111,959 111,959
Other comprehensive loss, net of tax (6,866) (6,866)
Stock-based compensation expense 5,174 5,174
Vesting of time based stock awards issued at grant date (shares) (13,681)        
Issuance of common stock related to employee stock purchase plan 608 608
Issuance of common stock related to employee purchase plan (shares) 10,417        
Ending balance, value at Sep. 30, 2018 $ 341 526,423 544,177 (9,290) 1,061,651
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2018 34,308,473        
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 (shares) 32,230        
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes $ 1 (1)
Time based stock awards granted (shares) 94,344        
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from AOCI (ASU 2018-02) 674 (674)
Beginning balance, value at Jun. 30, 2018 $ 341 524,176 505,229 (6,609) 1,023,137
Common Stock, Shares, Outstanding, Beginning Balance at Jun. 30, 2018 34,305,071        
Net Income 38,948 38,948
Other comprehensive loss, net of tax (2,681) (2,681)
Stock-based compensation expense 2,031 2,031
Vesting of time based stock awards issued at grant date (shares) (320,000)        
Issuance of common stock related to employee stock purchase plan 216 216
Issuance of common stock related to employee purchase plan (shares) 3,722        
Ending balance, value at Sep. 30, 2018 $ 341 526,423 544,177 (9,290) 1,061,651
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2018 34,308,473        
Beginning balance, value at Dec. 31, 2018 $ 342 528,380 584,494 (4,275) $ 1,108,941
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2018 34,387,919       34,387,919
Net Income 107,487 $ 107,487
Other comprehensive loss, net of tax 8,912 8,912
Stock-based compensation expense 6,648 6,648
Vesting of time based stock awards issued at grant date (shares) (13,995)        
Issuance of common stock related to employee stock purchase plan 585 585
Issuance of common stock related to employee purchase plan (shares) 11,723        
Cash dividends declared ($0.44 per share) (14,926) (14,926)
Common stock repurchased $ (7) (33,378) (33,385)
Common stock repurchased (shares) (822,200)        
Ending balance, value at Sep. 30, 2019 $ 336 502,566 677,055 4,637 $ 1,184,594
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2019 33,720,522       33,720,522
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 332 $ 332
Issuance of common stock related to options exercised (shares) 26,784        
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes $ 1 (1)
Vesting of performance based stock awards (shares) 17,655        
Time based stock awards granted (shares) 112,636        
Beginning balance, value at Jun. 30, 2019 $ 343 532,585 647,887 3,767 1,184,582
Common Stock, Shares, Outstanding, Beginning Balance at Jun. 30, 2019 34,539,853        
Net Income 36,495 36,495
Other comprehensive loss, net of tax 870 870
Stock-based compensation expense 3,147 3,147
Vesting of time based stock awards issued at grant date (shares) (1,251)        
Issuance of common stock related to employee stock purchase plan 213 213
Issuance of common stock related to employee purchase plan (shares) 4,120        
Cash dividends declared ($0.44 per share) (7,327) (7,327)
Common stock repurchased $ (7) (33,379) (33,386)
Common stock repurchased (shares) (822,200)        
Ending balance, value at Sep. 30, 2019 $ 336 $ 502,566 $ 677,055 $ 4,637 $ 1,184,594
Common Stock, Shares, Outstanding, Ending Balance at Sep. 30, 2019 33,720,522       33,720,522