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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Common stock, shares, issued at Dec. 31, 2015   43,413,000        
Beginning Balance, net of taxes at Dec. 31, 2015 $ 534,670 $ 434 $ (123,711) $ 508,066 $ (93,015) $ 242,896
Treasury stock, shares at Dec. 31, 2015     4,587,000      
Net Income 38,254         38,254
Other comprehensive income 10,003       10,003  
Common stock issued, shares   107,000        
Common stock issued, value 1 $ 1        
Treasury stock, shares acquired     580,000      
Treasury stock, acquired (10,268)   $ (10,268)      
Stock-based compensation 8,177     8,177    
Other (833)     (833)    
Common stock, shares, issued at Dec. 31, 2016   43,520,000        
Ending Balance, net of taxes at Dec. 31, 2016 580,004 $ 435 $ (133,979) 515,410 (83,012) 281,150
Treasury stock, shares at Dec. 31, 2016     5,167,000      
Net Income 82,957         82,957
Other comprehensive income 6,310       6,310  
Common stock issued, shares   228,000        
Common stock issued, value 2 $ 2        
Stock-based compensation 9,730     9,730    
Common stock dividends (2,760)         (2,760)
Tax withholding payments on stock-based awards (2,902)     (2,902)    
Proceeds from exercise of stock options 1,144     1,144    
Other $ 64     168   (104)
Common stock, shares, issued at Dec. 31, 2017 43,747,805 43,748,000        
Ending Balance, net of taxes at Dec. 31, 2017 $ 674,549 $ 437 $ (133,979) 523,550 (76,702) 361,243
Treasury stock, shares at Dec. 31, 2017 5,167,000   5,167,000      
Net Income $ 20,477         20,477
Other comprehensive income 29,050       29,050  
Common stock issued, shares   328,000        
Common stock issued, value 4 $ 4        
Treasury stock, shares acquired     200,000      
Treasury stock, acquired (4,930)   $ (4,930)      
Stock-based compensation 8,831     8,831    
Common stock dividends (51,664)         (51,664)
Tax withholding payments on stock-based awards (5,135)     (5,135)    
Proceeds from exercise of stock options 1,412     1,412    
Other $ (4)     (4)    
Common stock, shares, issued at Dec. 31, 2018 44,075,840 44,076,000        
Ending Balance, net of taxes at Dec. 31, 2018 $ 672,590 $ 441 $ (138,909) $ 528,654 $ (47,652) $ 330,056
Treasury stock, shares at Dec. 31, 2018 5,367,000   5,367,000