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Derivative Instruments (Details) (Designated as Hedging Instrument [Member], USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Liabilities
Total hedging instrument liabilities	$ 7,419	$ 0	$ 5,614
Other current liabilities [Member] \| Interest rate swaps [Member]
Liabilities
Interest rate swaps	0	0	5,614
Other noncurrent liabilities [Member] \| Interest rate swaps [Member]
Liabilities
Interest rate swaps	$ 7,419	$ 0	$ 0

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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