Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Shareholders’ Equity [Abstract]

Preferred Shares Outstanding

			At December 31, 2019			At December 31, 2018
Series	Earliest Redemption Date	Dividend Rate	Shares Outstanding	Liquidation Preference		Shares Outstanding	Liquidation Preference
			(Dollar amounts in thousands)
Series U	6/15/2017	5.625%	-	$	-	11,500	$	287,500
Series V	9/20/2017	5.375%	19,800		495,000	19,800		495,000
Series W	1/16/2018	5.200%	20,000		500,000	20,000		500,000
Series X	3/13/2018	5.200%	9,000		225,000	9,000		225,000
Series Y	3/17/2019	6.375%	-		-	11,400		285,000
Series Z	6/4/2019	6.000%	-		-	11,500		287,500
Series A	12/2/2019	5.875%	-		-	7,600		190,000
Series B	1/20/2021	5.400%	12,000		300,000	12,000		300,000
Series C	5/17/2021	5.125%	8,000		200,000	8,000		200,000
Series D	7/20/2021	4.950%	13,000		325,000	13,000		325,000
Series E	10/14/2021	4.900%	14,000		350,000	14,000		350,000
Series F	6/2/2022	5.150%	11,200		280,000	11,200		280,000
Series G	8/9/2022	5.050%	12,000		300,000	12,000		300,000
Series H	3/11/2024	5.600%	11,400		285,000	-		-
Series I	9/12/2024	4.875%	12,650		316,250	-		-
Series J	11/15/2024	4.700%	10,350		258,750	-		-
Series K	12/20/2024	4.750%	9,200		230,000	-		-
Total Preferred Shares			162,600	$	4,065,000	161,000	$	4,025,000

Schedule Of Issuance And Repurchases Of Common Shares

	2019				2018				2017
		Shares		Amount		Shares		Amount		Shares		Amount
Employee stock-based compensation and
exercise of stock options (Note 10)		287,734	$	33,564		277,511	$	12,525		564,583	$	42,500

Schedule Of Distribution Classification

	2019 (unaudited)
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
Ordinary Income		100.00	%	100.00	%	100.00	%	100.00	%
Long-Term Capital Gain		0.00	%	0.00	%	0.00	%	0.00	%
Total		100.00	%	100.00	%	100.00	%	100.00	%