Concentration of Credit Risk (Minimum Rents) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Future contracted minimum rentals leases
2016	$ 1,235,787
2017	1,177,207
2018	1,084,744
2019	1,012,399
2020	837,062
Thereafter	5,341,516
Total	10,688,715
Brookdale Senior Living
Future contracted minimum rentals leases
2016	160,597
2017	160,138
2018	159,864
2019	149,361
2020	33,963
Thereafter	23,500
Total	687,423
Kindred
Future contracted minimum rentals leases
2016	186,137
2017	186,390
2018	152,613
2019	135,803
2020	114,895
Thereafter	401,088
Total	1,176,926
Other
Future contracted minimum rentals leases
2016	889,053
2017	830,679
2018	772,267
2019	727,235
2020	688,204
Thereafter	4,916,928
Total	$ 8,824,366