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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Balance at beginning at Dec. 31, 2014 $ 80,513 $ 51,791 $ (5,051) $ 127,253
Balance at beginning (in shares) at Dec. 31, 2014 25,541      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common stock issued upon exercise of options and warrants $ 1,726 1,726
Common stock issued upon exercise of options and warrants (in shares) 1,140      
Repurchase of common stock $ (5,926) (5,926)
Repurchase of common stock (in shares) (1,064)      
Pension benefit obligation (1,599) (1,599)
Stock-based compensation 5,024 5,024
Net income 34,681 34,681
Balance at end at Dec. 31, 2015 $ 81,337 86,472 (6,650) 161,159
Balance at end (in shares) at Dec. 31, 2015 25,617      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common stock issued upon exercise of options and warrants $ 706 706
Common stock issued upon exercise of options and warrants (in shares) 448      
Repurchase of common stock $ (10,468) (10,468)
Repurchase of common stock (in shares) (2,478)      
Pension benefit obligation (32) (32)
Stock-based compensation 5,553 5,553
Net income 29,300 29,300
Balance at end at Dec. 31, 2016 $ 77,128 115,772 (6,682) 186,218
Balance at end (in shares) at Dec. 31, 2016 23,587      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common stock issued upon exercise of options and warrants $ 1,085 1,085
Common stock issued upon exercise of options and warrants (in shares) 647      
Repurchase of common stock $ (12,346) (12,346)
Repurchase of common stock (in shares) (2,745)      
Pension benefit obligation (500) (500)
Stock-based compensation 5,715 5,715
Net income 3,765 3,765
Balance at end at Dec. 31, 2017 $ 71,582 $ 119,537 $ (7,182) $ 183,937
Balance at end (in shares) at Dec. 31, 2017 21,489