Real Estate Investments (Future Lease Payments) (Details) $ in Thousands	Sep. 30, 2015 USD ($) property
Operating Leases, Future Minimum Payments Receivable [Abstract]
October 1, 2015 - December 31, 2015	$ 289,399
2016	1,225,267
2017	1,194,341
2018	1,158,149
2019	1,117,327
Thereafter	9,744,736
Total	14,729,219
Future Minimum Direct Financing Lease Payments
October 1, 2015 - December 31, 2015	1,166
2016	4,674
2017	4,273
2018	3,183
2019	2,397
Thereafter	7,916
Total	$ 23,609
Capital leased assets, number of units | property	37