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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair value disclosures
Long-term debt	$ 1,612,000	$ 1,147,000
Carrying amount
Fair value disclosures
Long-term debt	1,612,000	1,147,000
Estimated fair value
Fair value disclosures
Long-term debt	$ 1,697,654	$ 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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