Income Taxes - Taxability of Cash Distributions Paid on Common Shares (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Ordinary income		$ 2.55
Capital gains	$ 0.05	0.05
Return of capital	1.80	0.88
Total	$ 1.85	$ 3.48

Per share or unit amount of capital distribution in excess of tax basis earnings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 205
-Section 50
-Paragraph 7
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837

Name:	us-gaap_InvestmentCompanyTaxReturnOfCapitalDistributionPerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration