Concentration of Credit Risk (Minimum Rents) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Future contracted minimum rentals leases
2017	$ 1,357,270
2018	1,279,662
2019	1,204,538
2020	1,039,776
2021	961,145
Thereafter	5,668,947
Total	11,511,338
Brookdale Senior Living
Future contracted minimum rentals leases
2017	162,576
2018	162,089
2019	151,437
2020	34,410
2021	13,133
Thereafter	10,703
Total	534,348
Kindred
Future contracted minimum rentals leases
2017	199,798
2018	173,249
2019	160,730
2020	160,771
2021	160,813
Thereafter	408,810
Total	1,264,171
Ardent
Future contracted minimum rentals leases
2017	109,151
2018	109,151
2019	109,151
2020	109,151
2021	109,151
Thereafter	1,491,731
Total	2,037,486
Other
Future contracted minimum rentals leases
2017	885,745
2018	835,173
2019	783,220
2020	735,444
2021	678,048
Thereafter	3,757,703
Total	$ 7,675,333