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Fair Value Measurements Fair Value Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 1,662,099us-gaap_LongTermDebt	$ 1,155,097us-gaap_LongTermDebt
Long-term debt, fair value	$ 1,817,642us-gaap_LongTermDebtFairValue	$ 1,237,151us-gaap_LongTermDebtFairValue

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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