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Long-term Debt and Derivatives (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2010
Derivatives instruments impact on consolidated balance sheets
Fair value of derivative liabilities	$ 16,746
Derivatives designated as hedging instruments
Derivatives instruments impact on consolidated balance sheets
Fair value of derivative liabilities	13,034
Derivatives designated as hedging instruments \| Interest rate swap contracts
Derivatives instruments impact on consolidated balance sheets
Fair value of derivative liabilities	13,034
Derivatives not designated as hedging instruments
Derivatives instruments impact on consolidated balance sheets
Fair value of derivative liabilities	3,712
Derivatives not designated as hedging instruments \| Interest rate swap contracts
Derivatives instruments impact on consolidated balance sheets
Fair value of derivative liabilities	$ 3,712

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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