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

12 Months Ended

Dec. 31, 2011

Fair Values Of Assets And Liabilities [abstract]

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

	December 31, 2012
	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)	$	1,830,261					$	1,830,261
Derivatives not designated as hedging instruments:
Interest rate caps(i)			$	386			386
Interest rate swaps(iii)					$	133	133
Total assets	$	1,830,261	$	386	$	133	$	1,830,780
Liabilities
Derivatives designated as hedging instruments:
Interest rate swaps(iii)					$	133	$	133
Derivatives not designated as hedging instruments:
Interest rate caps(i)			$	394			394
Total liabilities	$		$	394	$	133	$	527

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(a) Excludes cash in banks of $227.7 million.

	December 31, 2011
	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.