Investments - Schedule of Loans Receivable (Details) $ in Thousands	Jun. 30, 2020 USD ($) Property	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance Outstanding	$ 99,211	$ 89,628
Mortgage Loan Receivable 8.80% Due at 2039
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	2
Interest Rate	8.80%
Principal Balance Outstanding	$ 12,000	12,000
Mortgage Loan Receivable 8.10% Due at 2059
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	2
Interest Rate	8.10%
Principal Balance Outstanding	$ 6,125	5,125
Mortgage Loan Receivable 8.53% Due at 2039
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	2
Interest Rate	8.53%
Principal Balance Outstanding	$ 7,300	7,300
Mortgage Loan Receivable 8.16% Due at 2034
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	69
Interest Rate	8.16%
Principal Balance Outstanding	$ 28,000	28,000
Mortgage Loan Receivable 8.05% Due at 2034
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	18
Interest Rate	8.05%
Principal Balance Outstanding	$ 34,604	34,604
Mortgage Loan Receivable 8.42% Due at 2040
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	1
Interest Rate	8.42%
Principal Balance Outstanding	$ 5,300	0
Leasehold Interest 10.69% Due 2039
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	2
Interest Rate	10.69%
Principal Balance Outstanding	$ 1,435	1,435
Leasehold Interest 2.25% Due 2034
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	1
Interest Rate	2.25%
Principal Balance Outstanding	$ 1,137	1,164
Leasehold Interest 2.41% Due 2034
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	1
Interest Rate	2.41%
Principal Balance Outstanding	$ 1,685	0
Leasehold Interest 4.97% Due 2038
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Secured Properties | Property	1
Interest Rate	4.97%
Principal Balance Outstanding	$ 1,625	$ 0