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Fair Value Measurements (Details) (Recurring basis, USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Level 2
Fair value measurements
Interest Rate Swap	$ 4,755	$ 16,347
Total
Fair value measurements
Interest Rate Swap	$ 4,755	$ 16,347

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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