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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair value disclosures
Current Maturities	$ (75,000)
Long-Term Debt, excluding Current Maturities	1,012,000	950,000
Carrying Amount
Fair value disclosures
Long-Term Debt	1,087,000	950,000
Current Maturities	(75,000)
Long-Term Debt, excluding Current Maturities	1,012,000	950,000
Estimated Fair Value
Fair value disclosures
Long-Term Debt	1,213,474	1,082,531
Current Maturities	(77,175)
Long-Term Debt, excluding Current Maturities	$ 1,136,299	$ 1,082,531

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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