Indebtedness debt covenants (Details) - USD ($)	9 Months Ended
Sep. 30, 2020	Mar. 23, 2018
debt covenants [Line Items]
dividend restriction AFFO	95.00%
Line of Credit Facility, Maximum Borrowing Capacity		$ 200,000,000
maximum dividends debt covenant	$ 179,800,000
Minimum Net Worth Required for Compliance	$ 1,900,000,000
debt yield	9.89%
payout ratio	88.10%
Total leverage ratio	63.70%

The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)(a)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998

Name:	us-gaap_MinimumNetWorthRequiredForCompliance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant