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Derivative Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair values of derivative instruments
Liabilities under derivative instruments	$ 1,218	$ 1,690
Designated as Hedging Instruments \| Interest rate contracts
Fair values of derivative instruments
Liabilities under derivative instruments	$ 1,218	$ 1,690

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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