Real Estate Portfolio - Summary of Investment in Loans (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Loans and Leases Receivable Disclosure
Principal Balance	$ 535,000
Carrying value	536,721
Future Funding Commitments	$ 40,000
Receivable interest rate	7.80%
Forum Convention Center Mortgage Loan | Senior Loans
Loans and Leases Receivable Disclosure
Principal Balance	$ 400,000
Carrying value	400,045
Future Funding Commitments	$ 0
Receivable interest rate	7.70%
Annual escalation rate	2.00%
Forum Convention Center Mortgage Loan | Senior Loans | Plan
Loans and Leases Receivable Disclosure
Receivable interest rate	7.854%
Chelsea Piers Mortgage Loan | Senior Loans
Loans and Leases Receivable Disclosure
Principal Balance	$ 65,000
Carrying value	64,880
Future Funding Commitments	$ 15,000
Receivable interest rate	7.00%
ROV Term Loan | Senior Loans
Loans and Leases Receivable Disclosure
Principal Balance	$ 70,000
Carrying value	71,796
Future Funding Commitments	$ 0
Receivable interest rate	9.00%
ROV Credit Facility | Senior Loans
Loans and Leases Receivable Disclosure
Principal Balance	$ 0
Carrying value	0
Future Funding Commitments	$ 25,000
ROV Credit Facility | Senior Loans | LIBOR
Loans and Leases Receivable Disclosure
Receivable interest rate	0.0275%