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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair value measurements and disclosures
Restricted-use investment securities	$ 1,823	$ 1,218
Carrying Amount
Fair value measurements and disclosures
Restricted-use investment securities	1,823	1,218
Derivative instruments	0	32
Long-term debt (including current portion)	(1,400,603)	(1,405,206)
Fair Value
Fair value measurements and disclosures
Restricted-use investment securities	1,823	1,218
Derivative instruments	0	32
Long-term debt (including current portion)	$ (1,384,603)	$ (1,410,255)

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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