Debt (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Schedule of Debt

		Interest Rate at			Balance at December 31,
(Amounts in thousands)		December 31, 2013			2013		2012
Mortgages Payable:
	Fixed rate		4.56%	$	7,563,133	$	6,771,001
	Variable rate		2.28%		768,860		1,828,221
			4.35%	$	8,331,993	$	8,599,222
Unsecured Debt:
	Senior unsecured notes		5.69%	$	1,350,855	$	1,358,008
	Unsecured revolving credit facilities		1.32%		295,870		1,170,000
			4.90%	$	1,646,725	$	2,528,008

Schedule of Maturities of Long-Term Debt Table Text Block

				Senior Unsecured
				Debt and
(Amounts in thousands)				Revolving Credit
Year Ending December 31,		Mortgages Payable		Facilities
2014	$	189,953	$	-
2015		584,358		500,000
2016		1,556,375		-
2017		630,548		-
2018		744,472		295,870
Thereafter		4,625,224		852,500