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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 balance at Dec. 31, 2017 $ 340   $ 431,544 $ (1,750) $ 950,438
Beginning balance (in shares) at Dec. 31, 2017 34,185,163 520,304,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income     73,011   73,011
Other comprehensive income, 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) 6,695,000        
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        
Beginning balance at Mar. 31, 2018 $ 341 522,316 467,933 (5,410) 985,180
Beginning balance (in shares) at Mar. 31, 2018 34,303,056        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income     37,296   37,296
Other comprehensive income, net of tax       (1,199) (1,199)
Stock-based compensation expense   1,667     1,667
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (1,255)        
Issuance of common stock related to employee stock purchase plan   193     193
Issuance of common stock related to employee stock purchase plan (in shares) 3,270        
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        
Beginning balance at Dec. 31, 2018 $ 342 528,380 584,494 4,275 $ 1,108,941
Beginning balance (in shares) at Dec. 31, 2018 34,387,919       34,387,919
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends declared     (7,599)   $ 7,599
Net Income     70,992   70,992
Other comprehensive income, net of tax       8,042 8,042
Stock-based compensation expense   3,501     3,501
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes   332      
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in 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 time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (12,744)        
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   373      
Issuance of common stock related to employee stock purchase plan (in shares) 7,603        
Ending balance at Jun. 30, 2019 $ 343 532,585 647,887 3,767 $ 1,184,582
Ending balance (in shares) at Jun. 30, 2019 34,539,853       34,539,853
Beginning balance at Mar. 31, 2019 $ 343 530,894 618,243 (992) $ 1,148,488
Beginning balance (in shares) at Mar. 31, 2019 34,537,193        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends declared     (7,599)   (7,599)
Net Income     37,243   37,243
Other comprehensive income, net of tax       4,759 4,759
Stock-based compensation expense   1,471     1,471
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes   37     37
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) 750        
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (1,800)        
Issuance of common stock related to employee stock purchase plan   183     $ 183
Issuance of common stock related to employee stock purchase plan (in shares) 3,710        
Common Stock, Dividends, Per Share, Declared         $ 0.22
Ending balance at Jun. 30, 2019 $ 343 $ 532,585 $ 647,887 $ 3,767 $ 1,184,582
Ending balance (in shares) at Jun. 30, 2019 34,539,853       34,539,853