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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, 2020   31,299        
Balance at period start 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 8,215   2,944     5,271
Stock-based compensation 3,387   3,387      
Dividends on common stock ($0.20 per share) (5,813)     (5,813)    
Comprehensive income (loss):            
Cash flow hedging gain, net 3,926       3,926  
Pension liability, net of income tax 631       631  
Foreign currency translation adjustments (3,674)       (3,674)  
Net income 9,860     9,860    
Comprehensive income 10,743          
Balance at period end (shares) at Mar. 31, 2021   31,299        
Balance at period end at Mar. 31, 2021 725,570 $ 313 388,959 461,464 (62,798) (62,368)
Balance at period start (shares) at Dec. 31, 2021   31,299        
Balance at period start at Dec. 31, 2021 785,435 $ 313 396,771 496,605 (54,203) (54,051)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock issued under employee plans 6,252   2,232     4,020
Stock-based compensation 4,463   4,463      
Dividends on common stock ($0.20 per share) (5,899)     (5,899)    
Comprehensive income (loss):            
Cash flow hedging gain, net 1,082       1,082  
Pension liability, net of income tax 521       521  
Foreign currency translation adjustments (163)       (163)  
Net income 14,975     14,975    
Comprehensive income $ 16,415          
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2020-06          
Balance at period end (shares) at Mar. 31, 2022   31,299        
Balance at period end at Mar. 31, 2022 $ 789,546 $ 313 365,555 526,472 $ (52,763) $ (50,031)
Balance at period end (Accounting Standards Update 2020-06) at Mar. 31, 2022 [1] $ (17,120)   $ (37,911) $ 20,791    
[1] (1)We recorded the cumulative impact of adopting ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity in 2022. Refer to Note 3 for further detail.