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Fair Value Disclosures Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Senior notes [1] $ 1,584,104 $ 1,818,561
[1] The recorded carrying value reflects the impact of various discounts and premiums that are amortized to interest cost over the respective terms of the senior notes.