Stockholders' Equity (Schedule Of Dividends On Preferred Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Class of Stock [Line Items]
Dividend paid	$ 754		$ 1,535
Preferred Stock Class C [Member]
Class of Stock [Line Items]
Dividend paid	528		1,055
Preferred stock, par value		$ 1.00		$ 1
Preferred stock, per share liquidation preference		$ 1,000		1,000
Preferred stock, dividend rate, percentage		4.00%
Quarterly paid per share		$ 10.00
Preferred Stock Class D [Member]
Class of Stock [Line Items]
Dividend paid	123		246
Preferred stock, par value		1.00		1
Preferred stock, per share liquidation preference		$ 5.00		5
Preferred stock, dividend rate, percentage		4.00%
Quarterly paid per share		$ 0.01
Preferred Stock Class E [Member]
Class of Stock [Line Items]
Dividend paid	$ 103		$ 234
Preferred stock, par value		1.00		1
Preferred stock, per share liquidation preference		$ 1,000		$ 1,000
Preferred stock, dividend rate, percentage		7.00%
Quarterly paid per share		$ 17.50