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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 Gain (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      
Comprehensive income 40,521       512 40,009
Common stock purchased for treasury (7,518)   (7,518)      
Common stock purchased for treasury, Shares     318      
Exercise of stock options 14,072 10   14,062    
Exercise of stock options, Shares 1,025 1,025        
Excess tax benefits 3,484     3,484    
Share-based compensation 3,932 6 (973) 4,899    
Share-based compensation, Shares   585 48      
Ending Balance at Jun. 30, 2013 $ 288,550 $ 487 $ (47,627) $ 124,578 $ 289 $ 210,823
Ending Balance, Shares at Jun. 30, 2013   48,746 2,786