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Fair Value Disclosures Narrative (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Senior notes $ 1,820,067us-gaap_SeniorNotes [1] $ 1,818,561us-gaap_SeniorNotes [1]
[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.