Income (Loss) Per Common Share - Computation of Weighted Average Basic and Diluted Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 11,400	$ (8,700)
Income from discontinued operations, net of income taxes	11,700	12,800
Net income	$ 23,100	$ 4,100
Weighted average number of diluted shares outstanding during the period - basic and diluted	25,500	25,500
Continuing operations	$ 330,150	$ (341,180)
Discontinued operations	461,450	482,350
Net income	$ 791,600	$ 141,170
Anti-dilutive shares excluded from calculation