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
3 Months Ended 9 Months Ended
Dec. 31, 2012
Sep. 30, 2015
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    
Stock Repurchase Program, Number of Shares Repurchased and Retired to Date   3,842,587  
Stock Repurchase Program, Value of Shares Repurchased and Retired to Date   $ 36,370  
Stock Repurchased and Retired During Period, Shares   1,391,887  
Stock Repurchased and Retired During Period, Value   $ 12,476  
Common Stock [Member]      
Class of Stock [Line Items]      
Stock Repurchased and Retired During Period, Shares   1,391,887  
Stock Repurchased and Retired During Period, Value   $ 14