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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Common Stock
Additional Paid In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Total
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        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
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     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     373
Issuance of common stock related to employee stock purchase plan (in shares) 7,603        
Cash dividends declared ($0.22 per share)     (7,599)   (7,599)
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        
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]          
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        
Cash dividends declared ($0.22 per share)     (7,599)   (7,599)
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        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect adjustment due to the adoption of ASC 326, net of tax         10,614
Beginning balance at Dec. 31, 2019 $ 331 482,286 705,105 2,959 $ 1,190,681
Beginning balance (in shares) at Dec. 31, 2019 33,241,496       33,241,496
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income $ 0 0 51,979 0 $ 51,979
Other comprehensive income, net of tax       11,709 11,709
Stock-based compensation expense   2,423     2,423
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (24,921)        
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares) 4,126        
Time based stock awards granted (in shares) 176,252        
Issuance of common stock related to employee stock purchase plan   382     382
Issuance of common stock related to employee stock purchase plan (in shares) 10,644        
Cash dividends declared ($0.22 per share)     (14,180)   (14,180)
Common stock repurchased $ (11) (44,157)     (44,168)
Common stock repurchased (in shares) (1,182,841)        
Ending balance at Jun. 30, 2020 $ 320 440,934 731,973 14,668 $ 1,187,895
Ending balance (in shares) at Jun. 30, 2020 32,224,756       32,224,756
Beginning balance at Mar. 31, 2020 $ 320 439,321 710,072 13,065 $ 1,162,778
Beginning balance (in shares) at Mar. 31, 2020 32,197,258        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income     28,856   28,856
Other comprehensive income, net of tax       1,603 1,603
Stock-based compensation expense   1,427     1,427
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (2,738)        
Time based stock awards granted (in shares) 24,068        
Issuance of common stock related to employee stock purchase plan   186     186
Issuance of common stock related to employee stock purchase plan (in shares) 6,168        
Cash dividends declared ($0.22 per share)     (6,955)   (6,955)
Ending balance at Jun. 30, 2020 $ 320 $ 440,934 731,973 $ 14,668 $ 1,187,895
Ending balance (in shares) at Jun. 30, 2020 32,224,756       32,224,756
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect adjustment due to the adoption of ASC 326, net of tax     $ (10,931)   $ (10,931)