Debt (Principal Payments On Mortgage Payable, Notes Payable, Senior Notes and Debentures) (Details) (USD $)	Dec. 31, 2013		Apr. 21, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600,000,000		$ 400,000,000
Line of credit facility, amount outstanding	0			0
2014	40,248,000
2015	206,380,000
2016	197,223,000
2017	378,110,000
2018	278,287,000
Thereafter	1,148,265,000
Long-term Debt	2,248,513,000	[1]
Senior Notes [Member]
Debt Instrument [Line Items]
2014	0
2015	0
2016	125,000,000
2017	200,000,000
2018	0
Thereafter	1,044,200,000
Long-term Debt	1,369,200,000
Mortgages Payable [Member]
Debt Instrument [Line Items]
2014	29,909,000
2015	206,007,000
2016	62,412,000
2017	177,654,000
2018	2,782,000
Thereafter	99,727,000
Long-term Debt	578,491,000
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
2014	10,339,000
2015	373,000
2016	9,811,000
2017	456,000	[2]
2018	275,505,000
Thereafter	4,338,000
Long-term Debt	$ 300,822,000

[1] The total debt maturities differ from the total reported on the consolidated balance sheet due to the unamortized discount or premium on certain senior notes and mortgages payable.

[2] Our $600.0 million revolving credit facility matures on April 21, 2017, subject to a one-year extension at our option. As of December 31, 2013, there was no balance outstanding under this credit facility.