Fair Values Of Assets And Liabilities Fair Value Measured On Recurring Basis (Tables)

6 Months Ended

Jun. 30, 2012

Fair Values Of Assets And Liabilities [abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	June 30, 2012
	(in thousands)
	Fair Value Measurements Using
	Level 1		Level 2		Level 3
	Quoted Prices In Active Markets For Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Assets/ Liabilities At Fair Value
Assets
Money market funds(i)(a)	$	1,542,706					$	1,542,706
Derivatives not designated as hedging instruments:
Interest rate caps(i)			$	2,194			2,194
Interest rate swaps(iii)					$	454	454
Total assets	$	1,542,706	$	2,194	$	454	$	1,545,354
Liabilities
Derivatives designated as hedging instruments:
Interest rate swaps(iii)					$	456	$	456
Derivatives not designated as hedging instruments:
Interest rate caps(i)			$	2,276			2,276
Total liabilities	$	—	$	2,276	$	456	$	2,732

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(a) Excludes cash in banks and cash invested in Guaranteed Investment Contracts of $263.0 million.

	December 31, 2011
	(in thousands)
	Fair Value Measurements Using
	Level 1		Level 2		Level 3
	Quoted Prices In Active Markets For Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Assets/ Liabilities At Fair Value
Assets
Money market funds(i)(a)	$	1,434,592					$	1,434,592
Derivatives not designated as hedging instruments:
Interest rate caps(i)			$	4,548			4,548
Interest rate swaps(iii)					$	2,004	2,004
Total assets	$	1,434,592	$	4,548	$	2,004	$	1,441,144
Liabilities
Derivatives designated as hedging instruments:
Interest rate swaps(iii)					$	6,440	$	6,440
Derivatives not designated as hedging instruments:
Interest rate caps(i)			$	4,768			4,768
Total liabilities	$	—	$	4,768	$	6,440	$	11,208

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(a) Excludes cash in banks and cash invested in Guaranteed Investment Contracts of $252.7 million.