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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair value disclosures
Current maturities		$ (75,000)
Long-Term Debt, excluding current maturities	1,147,000	1,012,000
Carrying Amount
Fair value disclosures
Long-term debt	1,147,000	1,087,000
Current maturities		(75,000)
Long-Term Debt, excluding current maturities	1,147,000	1,012,000
Estimated Fair Value
Fair value disclosures
Long-term debt	1,224,273	1,213,474
Current maturities		(77,175)
Long-Term Debt, excluding current maturities	$ 1,224,273	$ 1,136,299

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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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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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