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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair value disclosures
Debt	$ 1,752,000us-gaap_LongTermDebt	$ 1,147,000us-gaap_LongTermDebt
Carrying Amount
Fair value disclosures
Debt	1,752,000	1,147,000
Estimated Fair Value
Fair value disclosures
Debt	$ 1,850,867	$ 1,224,273

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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