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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common stock
Preferred Shares Issued
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance at Dec. 31, 2015 $ 293,092 $ 455   $ 70,789 $ 306,656 $ (4,006) $ (80,802)
Beginning balance, shares (in shares) at Dec. 31, 2015   45,525 10        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock option exercises $ (5,332) $ 1   905     (6,238)
Stock option exercises, shares (in shares) 124 124          
Purchases of treasury stock $ (8,510)           (8,510)
Treasury shares reissued 10,000     7,670     2,330
Retirement of treasury shares $ 0 $ (3)   (6,235)     6,238
Retirement of treasury shares, shares (in shares) (325) (325)          
Share-based compensation $ 10,288     10,288      
Net income 99,410       99,410    
Other comprehensive income (loss) [1] (2,402)         (2,402)  
Excess tax benefit (shortfall), net [2] (1,154)     (1,154)      
Declaration of dividends (24,202)       (24,202)    
Ending balance at Dec. 31, 2016 371,190 $ 453   82,263 381,864 (6,408) (86,982)
Ending balance, shares (in shares) at Dec. 31, 2016   45,324 10        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Tax expense (benefit) from AFS securities adjustment (1,486)            
Vesting of performance share units $ (1,183) $ 1   (1)     (1,183)
Vesting of performance share units, shares (in shares) 115 115          
Stock option exercises $ (6,039) $ 8   5,578     (11,625)
Stock option exercises, shares (in shares) 804 804          
Common stock issued $ 635 $ 1   634      
Common stock issued, shares (in shares) 26 26          
Purchases of treasury stock $ (18,141)           (18,141)
Retirement of treasury shares $ 0 $ (5)   (12,803)     12,808
Retirement of treasury shares, shares (in shares) (491) (491)          
Share-based compensation $ 10,515     10,515      
Net income 106,935       106,935    
Other comprehensive income (loss) [1] 127         127  
Declaration of dividends (24,051)       (24,051)    
Ending balance at Dec. 31, 2017 439,988 $ 458   86,186 464,748 (6,281) (105,123)
Ending balance, shares (in shares) at Dec. 31, 2017   45,778 10        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Tax expense (benefit) from AFS securities adjustment 76            
Vesting of performance share units $ (1,273) $ 1   (1)     (1,273)
Vesting of performance share units, shares (in shares) 127 127          
Stock option exercises $ (11,185) $ 19   36,568     (47,772)
Stock option exercises, shares (in shares) 1,890 1,890          
Grants and vesting of restricted stock $ (154) $ 1   (1)     (154)
Grants and vesting of restricted stock, shares (in shares)   80          
Common stock issued, shares (in shares) 80            
Purchases of treasury stock $ (25,276)           (25,276)
Retirement of treasury shares $ 0 $ (14)   (49,185)     49,199
Retirement of treasury shares, shares (in shares) (1,361) (1,361)          
Share-based compensation $ 12,786     12,786      
Net income 117,051       117,051    
Other comprehensive income (loss) [1] (4,748)         (4,748)  
Reclassification of income taxes upon adoption of ASU 2018-02         582 (582)  
Declaration of dividends (25,556)       (25,556)    
Ending balance at Dec. 31, 2018 501,633 $ 465   $ 86,353 $ 553,224 $ (8,010) $ (130,399)
Ending balance, shares (in shares) at Dec. 31, 2018   46,514 10        
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Tax expense (benefit) from AFS securities adjustment $ (1,560)            
[1] Represents change in fair value of available-for-sale investments, net of income tax provision of $76 thousand for the year ended December 31, 2017 and a change in fair value of available-for-sale investments, net of income tax benefit of $1,560 thousand and $1,486 thousand for the years ended December 31, 2018 and 2016, respectively.
[2] Excess tax benefit (shortfall), net for the year ended December 31, 2016 were recognized in additional paid-in capital. For the years ended December 31, 2018 and 2017 excess tax benefit (shortfall) were recognized in income tax expense in the consolidated statements of income when the share-based awards vest or are settled. See “—Note 9 (Share-Based Compensation).”