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
 3 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
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)   344,064 287,804    
Payments for repurchase of common stock   $ 19,779 $ 12,741 $ 7,809  
Stock Issued During Period, Shares, Acquisitions 1,716,690        
Stock Issued During Period, Shares, New Issues 342,640 342,640      
Stock Issued During Period, Value, New Issues $ 15,225 $ 15,225