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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Retained Earnings
Cost of Common Stock in Treasury
Accumulated Other Comprehensive Income (Loss), Net
Balance at Dec. 31, 2016 $ 672,650 $ 436,538 $ 290,824 $ (56,056) $ 1,344
Cumulative-effect adjustment at Dec. 31, 2016 (65)   (65)    
Balance, adjusted at Dec. 31, 2016 672,585 436,538 290,759 (56,056) 1,344
Increase (Decrease) in Shareholders' Equity          
Net income 16,206   16,206    
Other comprehensive loss (17)       (17)
Issuance of 34,191 and 48,765 common shares under stock based compensation awards for the three months ended on March 31, 2018 and 2017, respectively 1,878   721 1,157  
Cost of 15,784 and 900 shares of common stock acquired for treasury for the three months ended on March 31, 2018 and 2017, respectively (41)     (41)  
Common stock dividend ($0.22 and $0.18 per share for the three months ended on March 31, 2018 and 2017, respectively) (4,677)   (4,677)    
Balance at Mar. 31, 2017 685,934 436,538 303,009 (54,940) 1,327
Balance at Dec. 31, 2017 718,537 436,538 339,959 (54,628) (3,332)
Cumulative-effect adjustment at Dec. 31, 2017 0   718   (718)
Balance, adjusted at Dec. 31, 2017 718,537 436,538 340,677 (54,628) (4,050)
Increase (Decrease) in Shareholders' Equity          
Net income 19,116   19,116    
Other comprehensive loss (6,885)       (6,885)
Issuance of 34,191 and 48,765 common shares under stock based compensation awards for the three months ended on March 31, 2018 and 2017, respectively 1,346   535 811  
Cost of 15,784 and 900 shares of common stock acquired for treasury for the three months ended on March 31, 2018 and 2017, respectively (785)     (785)  
Common stock dividend ($0.22 and $0.18 per share for the three months ended on March 31, 2018 and 2017, respectively) (5,720)   (5,720)    
Balance at Mar. 31, 2018 $ 725,609 $ 436,538 $ 354,608 $ (54,602) $ (10,935)