Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended		46 Months Ended
		Jul. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Jun. 13, 2018
Subsidiary, Sale of Stock [Line Items]
Preferred Stock, Shares Issued			9,420,421		9,420,421			9,400,000
Proceeds from Issuance of Preferred Stock and Preference Stock	[1]				$ 511	$ 0
Preferred Stock, Shares Authorized			100,000,000		100,000,000			100,000,000
Preferred Stock, Par or Stated Value Per Share			$ 0.001		$ 0.001			$ 0.001
Common stock, shares authorized (in shares)			100,000,000		100,000,000			100,000,000
Common Stock, Par or Stated Value Per Share			$ 0.001		$ 0.001			$ 0.001
Dividends declared (in usd per share)			$ 0.45	$ 0.44	$ 0.90	$ 0.74
Dividends paid					$ (60,234)	$ (34,553)
Common shares issued and outstanding upon conversion of all convertible securities (in shares)			60,720,206		60,720,206			58,180,342
Number of shares authorized to be repurchased (in shares)									1,550,000
Shares repurchased			(88,184)	0	(88,184)	0	(790,149)
Average price per share (USD per share)			$ 13.2		$ 13.20		$ 13.34
Total cost			$ (1,164)		$ (1,200)		$ (10,500)
Shares Issued As Payment of Incentive Fee, Shares		19,094	0	0	19,094	0
Preferred Stock, Shares Outstanding			9,420,421		9,420,421			9,400,000
Stock Issued During Period, Shares, New Issues			383,700	0	2,568,700	0
Common ATM Program
Subsidiary, Sale of Stock [Line Items]
Maximum shares available to be issued under at the market program					10,000,000
Commissions and offering costs			$ 100		$ 700
Stock Issued During Period, Shares, New Issues			383,700		2,568,700
Series A Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage					6.75%
Preferred Stock, Par or Stated Value Per Share			$ 0.001		$ 0.001
Preferred Stock, Liquidation Preference Per Share			$ 25.00		$ 25.00
Preferred Stock Dividend Rate Variable Rate Spread					5.196%
Preferred Stock, Amount of Preferred Dividends in Arrears					$ 2,500	$ 1,600
Preferred Stock, Shares Outstanding			4,600,000		4,600,000			4,600,000
Series B Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage					6.25%
Preferred Stock, Par or Stated Value Per Share			$ 0.001		$ 0.001
Preferred Stock, Liquidation Preference Per Share			$ 25.00		$ 25.00
Preferred Stock Dividend Rate Variable Rate Spread					4.99%
Preferred Stock, Shares Outstanding			4,820,421		4,820,421			4,800,000

[1] Net of discounts and commissions.