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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 (in shares) at Dec. 31, 2022   31,299        
Balance at period start at Dec. 31, 2022 $ 745,545 $ 313 $ 413,235 $ 412,631 $ (57,858) $ (22,776)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock issued under employee plans 2,600   556     2,044
Stock-based compensation 5,726   5,726      
Dividends on common stock ($0.20 per share) (6,113)     (6,113)    
Comprehensive income:            
Cash flow hedging gain, net of income tax 877       877  
Pension liability, net of income tax 403       403  
Foreign currency translation adjustments 1,596       1,596  
Net income 1,819     1,819    
Comprehensive income 4,695          
Balance at period end (in shares) at Mar. 31, 2023   31,299        
Balance at period end at Mar. 31, 2023 752,453 $ 313 419,517 408,337 (54,982) (20,732)
Balance at period start (in shares) at Dec. 31, 2023   31,299        
Balance at period start at Dec. 31, 2023 834,222 $ 313 446,535 452,531 (50,170) (14,987)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock issued under employee plans 282   (562)     844
Stock-based compensation 6,240   6,240      
Dividends on common stock ($0.20 per share) (6,158)     (6,158)    
Settlement of convertible notes hedge transactions 0   10,980     (10,980)
Shares issued for the settlement of convertible notes 0   (5,169)     5,169
Comprehensive income:            
Cash flow hedging gain, net of income tax 4,448       4,448  
Pension liability, net of income tax 301       301  
Foreign currency translation adjustments (4,380)       (4,380)  
Net income 19,709     19,709    
Comprehensive income 20,078          
Balance at period end (in shares) at Mar. 31, 2024   31,299        
Balance at period end at Mar. 31, 2024 $ 854,664 $ 313 $ 458,024 $ 466,082 $ (49,801) $ (19,954)