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Derivative Instruments (Details 1) (Interest Expense [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest rate swaps [Member] \| Cash Flow Hedge [Member]
Effects of cash flow hedge derivative instruments on the accompanying Condensed Consolidated Statements of Comprehensive Income
Loss reclassified from AOCI (effective portion)	$ (1,605)	$ (6,678)	$ (3,180)	$ (8,672)
Interest rate swaps [Member] \| Fair Value Hedge [Member]
Effects of fair value hedge derivative instruments on the accompanying Condensed Consolidated Statements of Comprehensive Income
Gain (loss) recognized in income	0	(7,419)	0	(7,419)
Fixed rate debt [Member] \| Fair Value Hedge [Member]
Effects of fair value hedge derivative instruments on the accompanying Condensed Consolidated Statements of Comprehensive Income
Gain (loss) recognized in income	$ 0	$ 7,419	$ 0	$ 7,419

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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