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Consolidated Condensed 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, 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 notes discount (net of income tax expense) 39,145   39,145      
Convertible notes 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    
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 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)
Balance at period start (shares) at Dec. 31, 2019   31,299        
Balance at period start 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 (5,040)   (7,736)     2,696
Stock-based compensation 3,032   3,032      
Dividends on common stock ($0.20 per share) (5,703)     (5,703)    
Comprehensive income (loss):            
Foreign currency translation adjustments (9,988)       (9,988)  
Pension liability, net of income tax 535       535  
Cash flow hedging gain (loss), net of income tax 2,405       2,405  
Net income 5,927     5,927    
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (1,121)          
Balance at period end (shares) at Mar. 31, 2020   31,299        
Balance at period end at Mar. 31, 2020 $ 701,635 $ 313 $ 374,620 $ 471,068 $ (66,325) $ (78,041)