Per share or unit amount of distribution to shareholders. Includes, but is not limited to, dividend and capital gain. Excludes distribution for tax return of capital.

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 https://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837

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

Stockholders' Equity (Dividends on Series C) (Details) - $ / shares								12 Months Ended
	Nov. 16, 2021	Aug. 26, 2021	May 24, 2021	Feb. 19, 2021	Nov. 18, 2020	Aug. 12, 2020	Jul. 01, 2020	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Return of capital (in dollars per share)								$ 1.0512	$ 0.20
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, cash dividends declared (in dollars per share)	$ 0.40625	$ 0.40625	$ 0.40625	$ 0.40625	$ 0.40625	$ 0.40625	$ 0.53264	$ 1.625	$ 1.345