Real Estate Investments (Future Lease Payments) (Details) - Jun. 30, 2015 $ in Thousands		USD ($) property
Operating Leases, Future Minimum Payments Receivable [Abstract]
July 1, 2015 - December 31, 2015		$ 607,976
2016		1,243,488
2017		1,212,653
2018		1,176,142
2019		1,135,398
Thereafter		10,051,959
Total		15,427,616
Future Minimum Direct Financing Lease Payments
July 1, 2015 - December 31, 2015	[1]	2,333
2016	[1]	4,672
2017	[1]	4,271
2018	[1]	3,182
2019	[1]	2,380
Thereafter	[1]	7,937
Total	[1]	$ 24,775
Capital leased assets, number of units | property		37

[1] 37 properties are subject to direct financing leases and, therefore, revenue is recognized as direct financing lease income on the discounted cash flows of the lease payments. Amounts reflected are the minimum base rental cash payments due to the Company under the lease agreements on these respective properties.