Real Estate (Summary Of Real Estate Subject To Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property Subject to or Available for Operating Lease [Line Items]
Real estate subject to operating leases, gross	$ 4,731,525	$ 4,616,837
Less accumulated depreciation and amortization	(440,247)	(416,594)
Real estate subject to operating leases before work in process	4,291,278	4,200,243
Accounted for using the operating method, net of accumulated depreciation and amortization	4,316,989	4,260,962
Land and improvements
Property Subject to or Available for Operating Lease [Line Items]
Land and improvements	1,675,212	1,652,863
Buildings and improvements
Property Subject to or Available for Operating Lease [Line Items]
Buildings and improvements	3,055,023	2,962,684
Leasehold interests
Property Subject to or Available for Operating Lease [Line Items]
Leasehold interests	1,290	1,290
Work in progress
Property Subject to or Available for Operating Lease [Line Items]
Work in progress	$ 25,711	$ 60,719