Variable Interest Entities - Schedule of Variable Interest Entities (Details) $ in Thousands	Mar. 31, 2020 USD ($)
VIE tenants-operating leases
Variable Interest Entity [Line Items]
Maximum Loss Exposure and Carrying Amount	$ 1,379
CCRC OpCo
Variable Interest Entity [Line Items]
Maximum Loss Exposure and Carrying Amount	0
Unconsolidated development joint ventures
Variable Interest Entity [Line Items]
Maximum Loss Exposure and Carrying Amount	27,476
Loan - seller financing
Variable Interest Entity [Line Items]
Maximum Loss Exposure and Carrying Amount	9,750
CMBS and LLC investment
Variable Interest Entity [Line Items]
Maximum Loss Exposure and Carrying Amount	$ 35,037