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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Treasury Shares [Member]
Common Stock [Member]
Preferred Shares Issued [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2017 $ 439,988 $ (105,123) $ 458   $ 86,186 $ 464,748 $ (6,281)
Beginning balance (in shares) at Dec. 31, 2017   (11,043) (45,778) (10)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Vesting of performance share units (1,273) $ (1,273) $ 1   (1)    
Vesting of performance share units (in shares)   43 [1] 127        
Grants and vesting of restricted stock 0            
Grants and vesting of restricted stock, shares (in shares)     50        
Stock option exercises (3,520) $ (18,723) $ 8   15,195    
Stock option exercises (in shares)   568 [1] 804        
Retirement of treasury shares 0 $ 19,996 $ (6)   (19,990)    
Retirement of treasury shares, shares (in shares)   611 611        
Purchases of treasury stock (2,746) $ (2,746)          
Purchases of treasury stock (in shares)   (93)          
Share-based compensation 2,904       2,904    
Net income 40,055         40,055  
Other comprehensive income (loss) (4,050)           (4,050)
Reclassification of income taxes upon adoption of ASU 2018-02           582 (582)
Declaration of dividends (4,906)         (4,906)  
Ending balance at Mar. 31, 2018 466,452 $ (107,869) $ 461   84,294 496,878 (7,312)
Ending balance (in shares) at Mar. 31, 2018   (11,136) (46,148) (10)      
Beginning balance at Dec. 31, 2017 439,988 $ (105,123) $ 458   86,186 464,748 (6,281)
Beginning balance (in shares) at Dec. 31, 2017   (11,043) (45,778) (10)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 86,139            
Other comprehensive income (loss) (5,899)            
Ending balance at Jun. 30, 2018 493,431 $ (116,239) $ 463   85,925 532,443 (9,161)
Ending balance (in shares) at Jun. 30, 2018   (11,385) (46,257) (10)      
Beginning balance at Mar. 31, 2018 466,452 $ (107,869) $ 461   84,294 496,878 (7,312)
Beginning balance (in shares) at Mar. 31, 2018   (11,136) (46,148) (10)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock option exercises (1,716) $ (8,015) $ 4   6,295    
Stock option exercises (in shares)   244 [1] 353        
Retirement of treasury shares 0 $ 8,015 $ (2)   (8,013)    
Retirement of treasury shares, shares (in shares)   244 244        
Purchases of treasury stock (8,370) $ (8,370)          
Purchases of treasury stock (in shares)   (249)          
Share-based compensation 3,349       3,349    
Net income 46,084         46,084  
Other comprehensive income (loss) (1,849)           (1,849)
Declaration of dividends (4,923)         (4,923)  
Declaration of third quarter dividends (5,596)         (5,596)  
Ending balance at Jun. 30, 2018 493,431 $ (116,239) $ 463   85,925 532,443 (9,161)
Ending balance (in shares) at Jun. 30, 2018   (11,385) (46,257) (10)      
Beginning balance at Dec. 31, 2018 501,633 $ (130,399) $ 465   86,353 553,224 (8,010)
Beginning balance (in shares) at Dec. 31, 2018   (11,731) (46,514) (10)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Vesting of performance share units (2,069) $ (2,069) $ 2   (2)    
Vesting of performance share units (in shares)   56 [1] 148        
Grants and vesting of restricted stock (166) $ (166)          
Grants and vesting of restricted stock, shares (in shares)   5 [1] 25        
Stock option exercises 72 $ (1,367) $ 1   1,438    
Stock option exercises (in shares)   36 [1] 84        
Retirement of treasury shares 0 $ 3,602 $ (1)   (3,601)    
Retirement of treasury shares, shares (in shares)   97 97        
Purchases of treasury stock (10,117) $ (10,117)          
Purchases of treasury stock (in shares)   (321)          
Share-based compensation 3,140       3,140    
Net income 40,148         40,148  
Other comprehensive income (loss) 11,984           11,984
Declaration of dividends (5,575)         (5,575)  
Ending balance at Mar. 31, 2019 539,050 $ (140,516) $ 467   87,328 587,797 3,974
Ending balance (in shares) at Mar. 31, 2019   (12,052) (46,674) (10)      
Beginning balance at Dec. 31, 2018 501,633 $ (130,399) $ 465   86,353 553,224 (8,010)
Beginning balance (in shares) at Dec. 31, 2018   (11,731) (46,514) (10)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 77,441            
Other comprehensive income (loss) 23,939            
Ending balance at Jun. 30, 2019 566,066 $ (154,623) $ 467   90,226 614,067 15,929
Ending balance (in shares) at Jun. 30, 2019   (12,538) (46,698) (10)      
Beginning balance at Mar. 31, 2019 539,050 $ (140,516) $ 467   87,328 587,797 3,974
Beginning balance (in shares) at Mar. 31, 2019   (12,052) (46,674) (10)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Grants and vesting of restricted stock (402) $ (402)          
Grants and vesting of restricted stock, shares (in shares)   14 [1] 25        
Stock option exercises (11) $ (414) $ 0   403    
Stock option exercises (in shares)   14 [1] 27        
Retirement of treasury shares 0 $ 816 $ 0   (816)    
Retirement of treasury shares, shares (in shares)   28 28        
Purchases of treasury stock (14,107) $ (14,107)          
Purchases of treasury stock (in shares)   (486)          
Share-based compensation 3,311       3,311    
Net income 37,293         37,293  
Other comprehensive income (loss) 11,955           11,955
Declaration of dividends (5,547)         (5,547)  
Declaration of third quarter dividends (5,476)         (5,476)  
Ending balance at Jun. 30, 2019 $ 566,066 $ (154,623) $ 467   $ 90,226 $ 614,067 $ 15,929
Ending balance (in shares) at Jun. 30, 2019   (12,538) (46,698) (10)      
[1] All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of options exercised or performance share units or restricted stock vested. These shares have been cancelled by the Company.