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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     33,749   33,749
Other comprehensive income, net of tax       3,283 3,283
Stock-based compensation expense   2,029     2,029
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes   296     296
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) 26,034        
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) (10,944)        
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   190     190
Issuance of common stock related to employee stock purchase plan (in shares) 3,893        
Ending balance at Mar. 31, 2019 $ 343 530,894 618,243 (992) 1,148,488
Ending balance (in shares) at Mar. 31, 2019 34,537,193        
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     23,123   $ 23,123
Other comprehensive income, net of tax       10,106 10,106
Stock-based compensation expense   996     996
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (22,183)        
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares) 4,126        
Time based stock awards granted (in shares) 152,184        
Issuance of common stock related to employee stock purchase plan   196     196
Issuance of common stock related to employee stock purchase plan (in shares) 4,476        
Cash dividends declared ($0.22 per share)     (7,225)   (7,225)
Common stock repurchased $ (11) (44,157)     (44,168)
Common stock repurchased (in shares) (1,182,841)        
Ending balance at Mar. 31, 2020 $ 320 $ 439,321 710,072 $ 13,065 $ 1,162,778
Ending balance (in shares) at Mar. 31, 2020 32,197,258       32,197,258
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect adjustment due to the adoption of ASC 326, net of tax     $ (10,931)   $ (10,931)