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Derivative Financial Instruments (Schedule of Interest Rate Swap Agreements Impact on Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative Financial Instruments
Amount of Gain/(Loss) Recognized in OCI on Derivatives (Effective Portion)	$ (6,220)	$ (228)	$ (8,798)
Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (1,340)	$ (2,205)	$ (18,294)

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References+ Details