Summary of Significant Accounting Policies - Leases (Details) - USD ($)		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Lease, Practical Expedients, Package [true false]	true
Remaining lease term (years)		5 years
Rent expense related to operating lease		$ 299,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Prepaid Expense and Other Assets
Lease liability		$ 1,287,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]		Accrued Liabilities and Other Liabilities
Real estate taxes reimbursed		$ 15,998,000
Percentage of provision on rent receivables (in percentage)		1.00%
Cumulative effect of the adoption of the ASC 842	$ 42,808,000
Cash rent received		$ 27,225,000
Rental income		152,755,000
ASU 2016-02
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Cumulative effect of the adoption of the ASC 842	$ 42,808,000
Anthem, Thrive, Preferred Care and Senior Care
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Rental income		$ 33,238,000