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Derivative Instruments and Hedging Activities Effect of Derivative Instruments on Statement of Income and Comprehenive Income (Details) (Interest Rate Swap, Cash Flow Hedging Relationships, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	$ (4,705)	$ 976
Interest Expense
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (4,336)	$ (4,676)

- 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