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Fair Value of Financial Instruments (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Fair Value Disclosures [Abstract]      
Senior unsecured notes payable $ 201,000,000 $ 207,000,000 $ 209,000,000
Face amount $ 200,000,000 $ 200,000,000 $ 200,000,000