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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
Balance, shares at Dec. 31, 2015   31,779,000       484,000
Balance at Dec. 31, 2015 $ 410,086 $ 317 $ 253,458 $ 178,073 $ (15,416) $ (6,346)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 33,675     33,675    
Foreign currency translation adjustment 6,945       6,945  
Adjustment to post-retirement healthcare benefit liability, net of taxes 750       750  
Stock compensation expense 6,373   6,373      
Cumulative effect of accounting change (see Note 1) 1,249   1,249      
Net settlement of restricted stock units, shares   131,000       46,000
Net settlement of restricted stock units $ (1,539) $ 1 (1)     $ (1,539)
Stock options exercised, shares 175,125 175,000        
Stock options exercised $ 3,341 $ 2 3,339      
Balance, shares at Dec. 31, 2016   32,085,000       530,000
Balance at Dec. 31, 2016 460,880 $ 320 264,418 211,748 (7,721) $ (7,885)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 62,560     62,560    
Foreign currency translation adjustment 3,150       3,150  
Adjustment to post-retirement healthcare benefit liability, net of taxes 205       205  
Stock compensation expense 7,122   7,122      
Net settlement of restricted stock units, shares   203,000       85,000
Net settlement of restricted stock units $ (2,872) $ 3 (3)     $ (2,872)
Issuance of restricted stock, shares   2,000        
Stock options exercised, shares 42,058 42,000        
Stock options exercised $ 674 $ 0 674      
Balance, shares at Dec. 31, 2017   32,332,000       615,000
Balance at Dec. 31, 2017 531,719 $ 323 271,957 274,562 (4,366) $ (10,757)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 63,809     63,809    
Foreign currency translation adjustment (3,241)       (3,241)  
Adjustment to post-retirement healthcare benefit liability, net of taxes 723       723  
Stock compensation expense 9,189   9,189      
Net settlement of restricted stock units, shares   460,000       181,000
Net settlement of restricted stock units $ (7,165) $ 5 (5)     $ (7,165)
Issuance of restricted stock, shares   7,000        
Stock options exercised, shares 87,907 88,000        
Stock options exercised $ 1,385 $ 1 1,384      
Balance, shares at Dec. 31, 2018   32,887,000       796,000
Balance at Dec. 31, 2018 $ 596,693 $ 329 $ 282,525 $ 338,995 $ (7,234) $ (17,922)