Variable Interest Entities - Schedule of Variable Interest Entities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
VIE tenants-operating leases
Variable Interest Entity [Line Items]
Maximum loss exposure and carrying amount	$ 497
CCRC OpCo
Variable Interest Entity [Line Items]
Maximum loss exposure and carrying amount	164,271
Unconsolidated development joint ventures
Variable Interest Entity [Line Items]
Maximum loss exposure and carrying amount	24,171
Loan - seller financing
Variable Interest Entity [Line Items]
Maximum loss exposure and carrying amount	9,875
CMBS and LLC investment
Variable Interest Entity [Line Items]
Maximum loss exposure and carrying amount	$ 34,854