Stock Transactions - Preferred Stock Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	0
Beginning balance	$ 0
Dividends paid in Preferred Stock	$ 3,549	$ 3,392
Ending balance (in shares)	0
Ending balance	$ 0
Series A Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	40,500	29,249
Beginning balance	$ 202,144	$ 145,786
Issuance of Preferred Stock, net of offering cost (in shares)	14	2,996
Issuance of Preferred Stock, net of offering cost	$ 70	$ 14,979
Dividends paid in Preferred Stock (in shares)	0
Dividends paid in Preferred Stock	$ 2
Offering Costs	(5)
Amortization of offering costs	$ 24	$ 25
Ending balance (in shares)	40,514	32,245
Ending balance	$ 202,235	$ 160,790
Series C Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	1,400
Beginning balance	$ 6,966
Issuance of Preferred Stock, net of offering cost (in shares)	0
Issuance of Preferred Stock, net of offering cost	$ 0
Dividends paid in Preferred Stock (in shares)	0
Dividends paid in Preferred Stock	$ 0
Offering Costs	(5)
Amortization of offering costs	$ 1
Ending balance (in shares)	1,400
Ending balance	$ 6,962