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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Balance, value at Dec. 31, 2012 $ 274,604 $ 9,724 $ 26,117 $ 236,453 $ 2,310
Balance, shares at Dec. 31, 2012   18,670,566      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 22,384 $ 0 0 22,384 0
Unrealized loss on investment, net of tax effect 1,077 0 0 0 1,077
Share-based compensation 784 0 912 (128) 0
Exercise of stock options and similar instruments, value 69 $ 23 46 0 0
Exercise of stock options and similar instruments, shares   43,665      
Employee stock purchase plan, value $ 722 $ 16 706 0 0
Employee stock purchase plan, shares 30,869 30,869      
Dividend reinvestment and stock purchase plan, value $ 84 $ 2 82 0 0
Dividend reinvestment and stock purchase plan, shares   3,111      
Reclassification adjustment for gain realized on investment, net of tax effect of $805 0        
Common stock issued, shares   1,421,000      
Common stock issued 35,894 $ 740 35,154    
Dividends (14,443) 0 0 (14,443) 0
Balance, value at Dec. 31, 2013 321,175 $ 10,505 63,017 244,266 3,387
Balance, shares at Dec. 31, 2013   20,169,211.000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 51,806 $ 0 0 51,806 0
Unrealized loss on investment, net of tax effect 301 0 0 0 301
Share-based compensation 909 0 1,031 (122) 0
Exercise of stock options and similar instruments, value 1,439 $ 42 1,397 0 0
Exercise of stock options and similar instruments, shares   80,796      
Employee stock purchase plan, value $ 839 $ 19 820 0 0
Employee stock purchase plan, shares 35,682 35,682      
Dividend reinvestment and stock purchase plan, value $ 34 $ 1 33 0 0
Dividend reinvestment and stock purchase plan, shares   1,151      
Reclassification adjustment for gain realized on investment, net of tax effect of $805 (1,171) $ 0 0 0 (1,171)
Dividends (15,177) 0 0 (15,177) 0
Balance, value at Dec. 31, 2014 $ 360,155 $ 10,567 66,298 280,773 2,517
Balance, shares at Dec. 31, 2014 20,286,840 20,286,840.00      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 37,882 $ 0 0 37,882 0
Unrealized loss on investment, net of tax effect (206) 0 0 0 (206)
Share-based compensation 1,489 0 1,603 (114) 0
Exercise of stock options and similar instruments, value (111) $ 32 (143) 0 0
Exercise of stock options and similar instruments, shares   61,791      
Employee stock purchase plan, value $ 895 $ 17 878 0 0
Employee stock purchase plan, shares 33,318 33,318      
Reclassification adjustment for gain realized on investment, net of tax effect of $805 $ 0        
Dividends (15,885) $ 0 0 (15,885) 0
Balance, value at Dec. 31, 2015 $ 383,783 $ 10,616 $ 68,636 302,220 $ 2,311
Balance, shares at Dec. 31, 2015 20,381,949 20,381,949.000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption $ (436)     $ (436)