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Accounting for Derivatives (Details) (Interest rate hedges, USD $)							3 Months Ended
	Mar. 31, 2013 Designated as a hedging instrument	Dec. 31, 2012 Designated as a hedging instrument	Mar. 31, 2013 Designated as a hedging instrument Accrued liabilities	Dec. 31, 2012 Designated as a hedging instrument Accrued liabilities	Mar. 31, 2013 Designated as a hedging instrument Other long-term liabilities	Dec. 31, 2012 Designated as a hedging instrument Other long-term liabilities	Dec. 31, 2010 Terminated hedge	Mar. 31, 2013 Terminated hedge
Fair Value Asset (Liability)
Amount of interest rate swap termination payments							$ 43,000,000
Notional amount of interest rate swaps	250,000,000						585,000,000
Weighted average effective fixed interest rate on interest rate swaps (as a percent)	1.80%						4.60%
Deferred pre-tax loss to be reclassified during next 12 months	3,500,000							1,400,000
Derivatives liability designated as hedging instruments, Fair value	$ (8,727,000)	$ (9,916,000)	$ (3,497,000)	$ (3,873,000)	$ (5,230,000)	$ (6,043,000)

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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