Stock Transactions And Stock-Based Compensation (Key Terms of Shares) (Details) - Preferred stock - $ / shares				1 Months Ended
	Jul. 03, 2020	Dec. 31, 2019	Mar. 01, 2019	May 31, 2020
Preferred stock series A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, dividend rate, percent	4.75%	4.75%	4.75%
Preferred stock, liquidation preference per share			$ 1,000
Preferred stock series A | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion	6.6549
Preferred stock series A | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion	8.1522
Preferred stock series B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, dividend rate, percent	5.00%	0.00%		5.00%
Preferred stock, liquidation preference per share				$ 1,000
Preferred stock series B | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion				5.0081
Preferred stock series B | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion				6.1349