Fair Value Measurements - Summary of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial assets:
Preferred equity investment - face value	$ 0	$ 2,327
Mortgage Receivable [Member]
Financial assets:
Mortgage loans receivable - face value	0	29,500
Senior unsecured notes payable
Financial liabilities:
Senior unsecured notes payable - face value	300,000	300,000
Carrying Amount | Level 2 | Senior unsecured notes payable
Financial liabilities:
Senior unsecured notes payable	296,290	295,911
Carrying Amount | Level 3
Financial assets:
Preferred equity investments	0	3,800
Carrying Amount | Level 3 | Mortgage Receivable [Member]
Financial assets:
Mortgage loans receivable	0	29,500
Fair Value | Level 2 | Senior unsecured notes payable
Financial liabilities:
Senior unsecured notes payable	306,000	312,750
Fair Value | Level 3
Financial assets:
Preferred equity investments	0	3,674
Fair Value | Level 3 | Mortgage Receivable [Member]
Financial assets:
Mortgage loans receivable	$ 0	$ 29,500