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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 15, 2020	Sep. 01, 2020	Aug. 31, 2020	Aug. 10, 2020	Jul. 13, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Stockholders' Equity Note [Line Items]
Preferred stock redeemed, value									$ 140
Series H Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate	3.50%	3.50%			3.50%	3.50%		3.50%		3.50%
Proceeds from issuance of private placement	$ 2,200	$ 5,900			$ 3,100
Shares issued	225	590			308
Series F Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate			6.00%				6.00%		6.00%
Preferred stock redeemed, shares			6,465
Preferred stock, redemption price			$ 1,000
Preferred stock redeemed, value			$ 6,500
Series C Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate				6.00%			6.00%		6.00%
Preferred stock redeemed, shares				388
Preferred stock, redemption price				$ 10,000
Preferred stock redeemed, value				$ 3,900
Series G Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate						6.00%	6.00%	6.00%	6.00%	6.00%

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