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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
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 657   (1,344)     2,001
Stock-based compensation 2,303   2,303      
Dividends on common stock ($0.20 per share) (5,606)     (5,606)    
Comprehensive income (loss):            
Foreign currency translation adjustments 649       649  
Pension liability, net of income tax 510       510  
Cash flow hedging gain (loss), net of income tax 1,586       1,586  
Net income 10,657     10,657    
Total comprehensive income 13,402          
Balance at period end (shares) at Mar. 31, 2018   31,299        
Balance at period end at Mar. 31, 2018 642,628 $ 313 334,754 445,576 (46,333) (91,682)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of change in accounting principle | Accounting Standards Update 2014-09 [1] 440     440    
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 1,748   (769)     2,517
Stock-based compensation 2,703   2,703      
Dividends on common stock ($0.20 per share) (5,643)     (5,643)    
Convertible note discount (net of income tax expense) 39,145   39,145      
Convertible note hedge, (net of income tax benefit) (38,829)   (38,829)      
Issuance of warrants 30,567   30,567      
Comprehensive income (loss):            
Foreign currency translation adjustments (578)       (578)  
Pension liability, net of income tax 547       547  
Cash flow hedging gain (loss), net of income tax 106       106  
Net income 1,021     1,021    
Total comprehensive income 1,096          
Balance at period end (shares) at Mar. 31, 2019   31,299        
Balance at period end at Mar. 31, 2019 $ 693,057 $ 313 $ 374,555 $ 460,229 $ (55,662) $ (86,378)
[1] We recorded the cumulative impact of adopting ASU 2014-09, Revenue from Contracts with Customers, in 2018. See Note 16 for further discussion regarding the adoption of these accounting standards.