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Derivatives and Hedging Fair Value and Classification of Derivative Instruments on Balance Sheet (Details) (Interest Rate Swap, Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other Assets
Derivatives, Fair Value
Derivative asset, fair value	$ 0	$ 0
Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	$ (24,112)	$ (16,619)

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.

+ References+ Details

- 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