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Federal Income Taxes - Tax Status of Dividends (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Total (in dollars per share)	$ 0.29	$ 0.28	$ 0.28	$ 0.28	$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 1.13	$ 1.09	$ 1.05
Characterization Of Distributions For Federal Income Tax Purposes
Income Tax Contingency [Line Items]
Qualified dividend (in dollars per share)									0	0	0
Capital gain (in dollars per share)									0.240	0	0.230
Total (in dollars per share)									$ 1.060	$ 0.870	$ 1.050
Qualified dividend									0.00%	0.00%	0.00%
Capital gain									23.00%	0.00%	22.00%
Total									100.00%	100.00%	100.00%
Non-Section 199A \| Characterization Of Distributions For Federal Income Tax Purposes
Income Tax Contingency [Line Items]
Ordinary income (in dollars per share)									$ 0	$ 0	$ 0.820
Ordinary income									0.00%	0.00%	78.00%
Section 199A \| Characterization Of Distributions For Federal Income Tax Purposes
Income Tax Contingency [Line Items]
Ordinary income (in dollars per share)									$ 0.820	$ 0.870	$ 0
Ordinary income									77.00%	100.00%	0.00%