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Derivative Financial Instruments (Details) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair values of derivative instruments recorded in Balance Sheet
Derivative Asset, Fair Value	$ 0
Derivative Liability, Fair Value	0	3,530
Interest rate swaps [Member]
Fair values of derivative instruments recorded in Balance Sheet
Derivative Asset, Fair Value	0
Cash Flow Hedges [Member] \| Interest rate swaps [Member]
Fair values of derivative instruments recorded in Balance Sheet
Derivative Liability, Fair Value	$ 0	$ 3,530

Fair value of derivative asset, 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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- Definition

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.

+ References+ Details