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Derivative Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair values of derivative instruments
Liabilities under derivative instruments	$ 11,067	$ 12,341
Designated as Hedging Instruments \| Interest rate contracts
Fair values of derivative instruments
Liabilities under derivative instruments	$ 11,067	$ 12,341

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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