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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Balance at period start (shares) at Dec. 31, 2015   31,299        
Balance at period start at Dec. 31, 2015 $ 585,073 $ 313 $ 324,915 $ 414,506 $ (53,894) $ (100,767)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock issued under employee plans (869)   (4,217)     3,348
Tax benefit arising from common stock issued under employee plans 203   203      
Stock-based compensation 8,375   8,375      
Dividends on common stock (22,238)     (22,238)    
Comprehensive income (loss):            
Foreign currency translation adjustments         (4,501)  
Pension liability (net of income tax expense/benefit)         (476)  
Cash flow hedging gain (loss) (net of income tax expense/benefit)         345  
Net income 14,664     14,664    
Comprehensive income 10,032          
Balance at period end (shares) at Dec. 31, 2016   31,299        
Balance at period end at Dec. 31, 2016 580,576 $ 313 329,276 406,932 (58,526) (97,419)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock issued under employee plans (217)   (3,953)     3,736
Stock-based compensation 8,472   8,472      
Dividends on common stock (22,334)     (22,334)    
Comprehensive income (loss):            
Foreign currency translation adjustments         13,879  
Pension liability (net of income tax expense/benefit)         645  
Cash flow hedging gain (loss) (net of income tax expense/benefit)         (5,076)  
Net income 55,487     55,487    
Comprehensive income 64,935          
Balance at period end (shares) at Dec. 31, 2017   31,299        
Balance at period end at Dec. 31, 2017 631,432 $ 313 333,795 440,085 (49,078) (93,683)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock issued under employee plans 2,694   (2,094)     4,788
Stock-based compensation 10,037   10,037      
Dividends on common stock (22,477)     (22,477)    
Comprehensive income (loss):            
Foreign currency translation adjustments         (8,369)  
Pension liability (net of income tax expense/benefit)         (672)  
Cash flow hedging gain (loss) (net of income tax expense/benefit)         8,331  
Net income 40,854     40,854    
Comprehensive income 40,144          
Balance at period end (shares) at Dec. 31, 2018   31,299        
Balance at period end at Dec. 31, 2018 662,270 $ 313 $ 341,738 464,851 (55,737) $ (88,895)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09 and 2018-02 [Member] [1] $ 440     $ 6,389 $ (5,949)  
[1] We recorded the cumulative impact of adopting ASU 2014-09, Revenue from Contracts with Customers, (and its amendments) and ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) in 2018. See Note 16 to the consolidated financial statements for further discussion regarding the adoption of accounting standards during 2018.