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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) [2] (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, 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) [2] 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      
[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.
[2] Represents change in fair value of available-for-sale investments, net of income tax provision of $3,916 thousand for the three months ended March 31, 2019 and a change in fair value of available-for-sale investments, net of income tax benefit of $1,219 thousand for the three months ended March 31, 2018.