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Derivative Financial Instruments - Derivative Instruments Fair Value Table (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value
Fair value, asset	$ 4,418	$ 0
Fair value, liability	2,065	9,370
Interest Rate Swap \| Not Designated as Hedging Instrument \| Receivables and Other Assets
Derivatives, Fair Value
Fair value, asset	4,418
Interest Rate Swap \| Not Designated as Hedging Instrument \| Derivative Financial Instruments
Derivatives, Fair Value
Fair value, liability	$ 2,065	$ 9,370

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