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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial assets (liabilities):
Restricted-use investment securities	$ 1,052	$ 1,218
Carrying Amount
Financial assets (liabilities):
Restricted-use investment securities	1,052	1,218
Derivative instruments	26	32
Long-term debt (including current portion)	(1,403,941)	(1,405,206)
Fair Value
Financial assets (liabilities):
Restricted-use investment securities	1,052	1,218
Derivative instruments	26	32
Long-term debt (including current portion)	$ (1,407,671)	$ (1,410,255)

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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