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Consolidated Statement of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Earnings [Member]
Beginning Balance at Dec. 31, 2012 $ 234,059 $ 471 $ (39,136) $ 102,133 $ (223) $ 170,814
Beginning Balance, Shares at Dec. 31, 2012   47,136 2,420      
Net income 20,945         20,945
Unrealized gain on hedging derivative, net of taxes of $31 40       40  
Unrealized losses on available-for-sale securities, net of taxes of $0 (8)       (8)  
Common stock purchased for treasury (5,069)   (5,069)      
Common stock purchased for treasury, Shares     215      
Exercise of stock options 5,859 5   5,854    
Exercise of stock options, Shares 459 459        
Excess tax benefits 1,405     1,405    
Share-based compensation 1,233 6 (937) 2,164    
Share-based compensation, Shares   572 41      
Ending Balance at Mar. 31, 2013 $ 258,464 $ 482 $ (45,142) $ 111,556 $ (191) $ 191,759
Ending Balance, Shares at Mar. 31, 2013   48,167 2,676