Summary of Significant Accounting Policies - Narrative (Details)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 01, 2019 lease_option
Significant Accounting Policies [Line Items]
Accounts receivable, net representing rental income accrued	$ 42,400,000	$ 42,100,000
Right-of-use asset	1,400,000
Operating lease liability	1,500,000
Minimum
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts receivables representing rental income accrued	$ 36,900	$ 30,000
Operating lease term of contract	1 year
Maximum
Significant Accounting Policies [Line Items]
Operating lease term of contract	15 years
Corporate Headquarters
Significant Accounting Policies [Line Items]
Number of options to extend lease | lease_option			1
Lease renewal term			5 years