Distributions (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Distributions
Minimum distribution of taxable income (as a percent)									90.00%
Ordinary taxable distribution									$ 0.936	$ 2.084	$ 0.349
Unrecaptured Section 1250 gain									0.894	0.132	0.636
Long-term capital gain									0.450	0.064	1.295
Total	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 2.280	$ 2.280	$ 2.280