Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Income from continuing operations	$ 41,939	$ 60,075	$ 56,641
Loss from discontinued operations (see Note 7)	0	0	(23,797)
Net income	$ 41,939	$ 60,075	$ 32,844
Weighted average shares outstanding - basic and diluted (in shares)	5,120,922	5,118,198	5,116,838
Income from continuing operations - basic and diluted (in usd per share)	$ 8.19	$ 11.74	$ 11.07
Loss from discontinued operations - basic and diluted (in usd per share)	0	0	(4.65)
Net income per common share - basic and diluted (in usd per share)	$ 8.19	$ 11.74	$ 6.42