(Summary Of Real Estate Subject To Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property Subject to or Available for Operating Lease [Line Items]
Real Estate Subject to Operating Leases, Gross	$ 4,018,824	$ 3,434,193
Less accumulated depreciation and amortization	(333,238)	(270,115)
Real estate subject to operating leases before work in process	3,685,586	3,164,078
Work in process	86,579	60,322	26,699
Real estate subject to operating leases, net	3,769,817	3,224,288
Deferred Revenue, Revenue Recognized	487	(222)	(93)
Deferred Revenue, Leases, Allowances	3,270	4,870
Deferred Revenue, Leases, Net	25,458	25,187
Land And Improvements [Member]
Property Subject to or Available for Operating Lease [Line Items]
Real estate subject to operating leases, gross	1,461,263	1,313,672
Buildings And Improvements [Member]
Property Subject to or Available for Operating Lease [Line Items]
Buildings and improvements	2,556,271	2,119,231
Leasehold Interests [Member]
Property Subject to or Available for Operating Lease [Line Items]
Leasehold interests	1,290	1,290
Work In Process [Member]
Property Subject to or Available for Operating Lease [Line Items]
Work in process	$ 84,231	$ 60,210