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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Carrying value and fair value of long-term debt
Carrying Value	$ 219,000	$ 227,000
Fair Value	223,750	231,000
Fixed-rate bonds [Member]
Carrying value and fair value of long-term debt
Carrying Value	200,000	200,000
Fair Value	204,750	204,000
Variable rate debt [Member]
Carrying value and fair value of long-term debt
Carrying Value	19,000	27,000
Fair Value	$ 19,000	$ 27,000

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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