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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, 2018   31,299        
Balance at period start at Dec. 31, 2018 $ 662,270 $ 313 $ 341,738 $ 464,851 $ (55,737) $ (88,895)
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):            
Cash flow hedging gain (loss) (net of income tax expense/benefit)         (3,592)  
Pension liability (net of income tax expense/benefit)         27  
Foreign currency translation adjustments         25  
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):            
Cash flow hedging gain (loss) (net of income tax expense/benefit)         (6,438)  
Pension liability (net of income tax expense/benefit)         (4,929)  
Foreign currency translation adjustments         6,963  
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock issued under employee plans 11,396   (2,192)     13,588
Stock-based compensation 16,335   16,335      
Dividends on common stock ($.80 per share) (23,354)     (23,354)    
Comprehensive income (loss):            
Cash flow hedging gain (loss) (net of income tax expense/benefit)         9,601  
Pension liability (net of income tax expense/benefit)         6,949  
Foreign currency translation adjustments         (7,072)  
Net income 62,542     62,542    
Comprehensive income 72,020          
Balance at period end (shares) at Dec. 31, 2021   31,299        
Balance at period end at Dec. 31, 2021 $ 785,435 $ 313 $ 396,771 $ 496,605 $ (54,203) $ (54,051)