Subsequent Events (Details) - USD ($)									3 Months Ended
	Jun. 27, 2022	May 27, 2022	Apr. 29, 2022	Apr. 27, 2022	Apr. 14, 2022	Mar. 15, 2022	Feb. 28, 2022	Jan. 27, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Subsequent Event [Line Items]
Preferred stock dividends paid									$ 2,995,000	$ 2,486,000
Common stock dividends, cash paid (in dollars per share)									$ 0.10	$ 0.10
Aggregate amount paid to holders of record									$ 29,108,000	$ 20,057,000
Common stock, shares issued (in shares)									100,361,000		94,152,000
Issuance of common stock, net of expenses									$ 46,427,000	$ 52,960,000
Series C Preferred Stock
Subsequent Event [Line Items]
Preferred stock dividends, cash paid (in dollars per share)						$ 0.14583	$ 0.14583	$ 0.14583	$ 0.14583	$ 0.14583
Preferred stock dividends paid						$ 998,500	$ 998,500	$ 998,500	$ 2,995,500
Subsequent Event | 2021 Common stock ATM Sales Agreement
Subsequent Event [Line Items]
Common stock, shares issued (in shares)					2,809,000
Issuance of common stock, net of expenses					$ 22,974,000
Payments of stock issuance costs					$ 231,000
Subsequent Event | Forecast
Subsequent Event [Line Items]
Common stock dividends, cash paid (in dollars per share)		$ 0.10	$ 0.10
Aggregate amount paid to holders of record			$ 10,360,000
Subsequent Event | Forecast | Series C Preferred Stock
Subsequent Event [Line Items]
Preferred stock dividends, cash paid (in dollars per share)	$ 0.14583	$ 0.14583		$ 0.14583
Preferred stock dividends paid				$ 998,000