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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative effect of change in accounting principle(b)
 [1]
Common Stock [Member]
Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative effect of change in accounting principle(b)
 [1]
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Loss [Member]
Cumulative effect of change in accounting principle(b)
Treasury Stock [Member]
Balance at period start (shares) at Dec. 31, 2017     31,299            
Balance at period start 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 ($.80 per share) (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)
Balance at period end (Accounting Standards Update 2014-09 and 2018-02 [Member]) at Dec. 31, 2018   $ 440       $ 6,389   $ (5,949)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Common stock issued under employee plans 4,315     (3,843)         8,158
Stock-based compensation 11,779     11,779          
Dividends on common stock ($.80 per share) (22,627)       (22,627)        
Convertible notes discount, net 39,145     39,145          
Convertible notes debt issuance costs (1,233)     (1,233)          
Convertible notes hedge, net (38,829)     (38,829)          
Issuance of warrants 30,567     30,567          
Comprehensive income (loss):                  
Foreign currency translation adjustments             25    
Pension liability (net of income tax expense/benefit)             27    
Cash flow hedging gain (loss) (net of income tax expense/benefit)             (3,592)    
Net income 28,620       28,620        
Comprehensive income 25,080                
Balance at period end (shares) at Dec. 31, 2019     31,299            
Balance at period end at Dec. 31, 2019 710,467   $ 313 379,324 470,844   (59,277)   (80,737)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Common stock issued under employee plans 3,291     (9,807)         13,098
Stock-based compensation 13,111     13,111          
Dividends on common stock ($.80 per share) (22,944)       (22,944)        
Comprehensive income (loss):                  
Foreign currency translation adjustments             6,963    
Pension liability (net of income tax expense/benefit)             (4,929)    
Cash flow hedging gain (loss) (net of income tax expense/benefit)             (6,438)    
Net income 9,517       9,517        
Comprehensive income 5,113                
Balance at period end (shares) at Dec. 31, 2020     31,299            
Balance at period end at Dec. 31, 2020 $ 709,038   $ 313 $ 382,628 $ 457,417   $ (63,681)   $ (67,639)
[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.