Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal income tax expense	$ (4,265)	$ (1,302)	$ (738)
Net operating loss	11,000
Federal income tax basis difference	168,000
Deferred tax liabilities net	$ 2,509	$ 5,542
Dividends cash declared	$ 0.90	$ 0.90	$ 1.00
Regular dividends			0.90
Common share and special dividend			0.10
Taxable ordinary income federal income tax purposes	0.405	0.468	0.531
Capital gain distributions	0.27	$ 0.432	$ 0.469
Capital gain distributions remaining	$ 0.225
Subsidiaries
Federal income tax expense	$ 0