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Consolidated Statements of Changes in Shareholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Accumulated Earnings
Accumulated Other Comprehensive Income
Beginning Balance at Dec. 31, 2009 (As previously reported) $ 306,133 $ 189   $ 176,868 $ 126,348 $ 2,728
Beginning Balance (As adjusted) 304,748 189   176,868 124,963 2,728
Beginning Balance (Cumulative effect of accounting change - deferred policy acquisition costs) (1,385)       (1,385)  
Beginning Balance, Shares at Dec. 31, 2009 (As previously reported)   18,895,246        
Beginning Balance, Shares (As adjusted)   18,895,246        
Comprehensive income:            
Net income 34,520       34,520  
Net income at Jan. 01, 2010 (As previously reported) 34,606          
Net income (As adjusted) (86)          
Other comprehensive income:            
Change in unrealized gains, net of tax (1,748)         (1,748)
Change in deferred tax valuation allowance (715)         (715)
Comprehensive income 32,057          
Comprehensive income at Jan. 01, 2010 (As previously reported) 32,143          
Comprehensive income (As adjusted) 32,057          
Common stock issued upon exercise of options 1,455 2   1,453    
Common stock issued upon exercise of options, Shares 153,157 153,157        
Restricted common stock issued 163     163    
Restricted common stock issued, Shares   12,246        
Share-based compensation 2,162     2,162    
Tax benefit of share-based compensation 238     238    
Purchase of treasury stock (12,102)   (12,102)      
Purchase of treasury stock, Shares     (708,608)      
Ending Balance at Dec. 31, 2010 328,721 191 (12,102) 180,884 159,483 265
Ending Balance, Shares at Dec. 31, 2010   19,060,649 (708,608)      
Comprehensive income:            
Net income 24,181       24,181  
Net income at Jan. 01, 2011 (As previously reported) 24,125          
Net income (As adjusted) 56          
Other comprehensive income:            
Change in unrealized gains, net of tax 1,986         1,986
Change in deferred tax valuation allowance (36)         (36)
Comprehensive income 26,131          
Comprehensive income at Jan. 01, 2011 (As previously reported) 26,075          
Comprehensive income (As adjusted) 26,131          
Common stock issued upon exercise of options 3,339 3   3,336    
Common stock issued upon exercise of options, Shares 338,350 338,350        
Restricted common stock issued 210     210    
Restricted common stock issued, Shares   9,513        
Share-based compensation 261     261    
Tax benefit of share-based compensation 1,043     1,043    
Purchase of treasury stock (10,268)   (10,268)      
Purchase of treasury stock, Shares     (549,642)      
Ending Balance at Dec. 31, 2011 (As previously reported) 350,852          
Ending Balance (As adjusted) (1,415)          
Ending Balance at Dec. 31, 2011 349,437 194 (22,370) 185,734 183,664 2,215
Ending Balance, Shares at Dec. 31, 2011   19,408,512 (1,258,250)      
Comprehensive income:            
Net income 29,353       29,353  
Other comprehensive income:            
Change in unrealized gains, net of tax 764         764
Change in deferred tax valuation allowance 0          
Comprehensive income 30,117          
Common stock issued upon exercise of options 781 1   780    
Common stock issued upon exercise of options, Shares 86,800 86,800        
Restricted common stock issued 240     240    
Restricted common stock issued, Shares   18,164        
Share-based compensation 226     226    
Tax benefit of share-based compensation 421     421    
Ending Balance at Dec. 31, 2012 $ 381,222 $ 195 $ (22,370) $ 187,401 $ 213,017 $ 2,979
Ending Balance, Shares at Dec. 31, 2012   19,513,476 (1,258,250)