Fair Value Measurements - Summary of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial assets:
Preferred equity investments - face value	$ 2,327	$ 4,531
Mortgage Loan Receivable
Financial assets:
Mortgage loans receivable - face value	29,500	12,375
Senior Unsecured Notes
Financial liabilities:
Senior unsecured notes payable - face value	300,000	300,000
Carrying Amount \| Level 2 \| Senior Unsecured Notes
Financial liabilities:
Senior unsecured notes payable	295,911	295,153
Carrying Amount \| Level 3
Financial assets:
Preferred equity investments	3,800	5,746
Carrying Amount \| Level 3 \| Mortgage Loan Receivable
Financial assets:
Mortgage loans receivable	29,500	12,299
Fair Value \| Level 2 \| Senior Unsecured Notes
Financial liabilities:
Senior unsecured notes payable	312,750	289,500
Fair Value \| Level 3
Financial assets:
Preferred equity investments	3,674	6,246
Fair Value \| Level 3 \| Mortgage Loan Receivable
Financial assets:
Mortgage loans receivable	$ 29,500	$ 12,375

Face (par) amount of debt instrument at time of issuance.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of notes payable.

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