Income Taxes (Schedule of Dividends Paid, Per Share) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Examination [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 3.8025	$ 4.41	$ 4.20
Ordinary Income [Member]
Income Tax Examination [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	2.87799	3.50400	4.20000
Capital Gain [Member]
Income Tax Examination [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	0.43890	0.10999	0
Return of Capital [Member]
Income Tax Examination [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.48562	$ 0.79603	$ 0