Debt (Principal Payments On Mortgage Payable, Notes Payable, Senior Notes and Debentures) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
2016	$ 15,477
2017	276,426
2018	290,984
2019	25,567
2020	215,310
Thereafter	1,736,030
Long-term debt	2,559,794	[1]
Mortgages Payable
Debt Instrument [Line Items]
2016	5,665
2017	222,469
2018	15,477
2019	25,006
2020	64,687
Thereafter	138,690
Long-term debt	471,994
Notes Payable
Debt Instrument [Line Items]
2016	9,812
2017	53,957	[2]
2018	275,507
2019	561
2020	623
Thereafter	3,140
Long-term debt	343,600
Senior Notes and Debentures
Debt Instrument [Line Items]
2016	0
2017	0
2018	0
2019	0
2020	150,000
Thereafter	1,594,200
Long-term debt	$ 1,744,200

[1] The total debt maturities differ from the total reported on the consolidated balance sheet as of December 31, 2015 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, 2015, there was $53.5 million outstanding under this credit facility.