Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Oct. 26, 2009
Stockholders' Equity Note [Abstract]        
Preferred stock, shares authorized (in shares) 10,000,000      
Preferred Stock, par value (in dollars per share) $ 0.001      
Common stock, shares authorized to repurchase (in shares)       4,000,000
Remaining number of shares available to be repurchased 1,667,724      
Common stock repurchases (in shares) 287,804 216,895    
Payments for repurchase of common stock $ 12,741 $ 7,809 $ 3,224