Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Share Repurchase Program (Details)

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Stockholders' Equity Share Repurchase Program (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Class of Stock [Line Items]      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 25,000,000   10,000,000
Stock Repurchase Program, Number of Additional Shares Authorized to be Repurchased   15,000,000  
Repurchase of common stock, shares (2,450,700)    
Repurchase of common stock $ 23,894    
Common Stock [Member]
     
Class of Stock [Line Items]      
Repurchase of common stock, shares 2,450,700    
Repurchase of common stock $ 25