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Derivative Instruments (Details) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Liabilities
Total hedging instrument liabilities	$ 0	$ 0	$ 7,419
Interest rate swaps [Member] \| Other noncurrent liabilities [Member]
Liabilities
Interest rate swaps	$ 0	$ 0	$ 7,419

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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