Debt - Additional Information (Details)	6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2007 USD ($)
Debt Instrument [Line Items]
Debt default, number of loans | loan	2
Debt default, amount	$ 50,525,000
Capitalized interest	$ 648,000	$ 52,000
Mortgages and Notes Payable
Debt Instrument [Line Items]
Weighted average interest rate	4.50%		4.50%
6.804% Trust Preferred Securities
Debt Instrument [Line Items]
Stated interest rate				6.804%
Face amount of debt instrument				$ 200,000,000
Interest rate, effective percentage	2.46%
Principal amount outstanding	$ 129,120,000		$ 129,120,000
Unamortized debt issuance costs	$ 1,675,000		$ 1,724,000
6.804% Trust Preferred Securities | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
Minimum | Mortgages and Notes Payable
Debt Instrument [Line Items]
Stated interest rate	3.50%		3.50%
Maximum | Mortgages and Notes Payable
Debt Instrument [Line Items]
Stated interest rate	6.50%		6.50%