Business Segment and Related Information - Reconciliation of Segment Gross Profit to Net Income (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting [Abstract]
Segment gross profit (loss)	$ 10,734,000	$ (2,065,000)	$ 21,531,000	$ 13,314,000
General and administrative expenses	(9,637,000)	(17,400,000)	(22,393,000)	(31,385,000)
Interest expense, net	(4,826,000)	(4,102,000)	(8,456,000)	(9,154,000)
Loss on extinguishment of debt	0	0	(8,603,000)	0
Income from equity method investment	326,000	663,000	622,000	1,217,000
Income tax benefit	0	5,628,000	0	6,389,000
Net loss	$ (3,403,000)	$ (17,276,000)	$ (17,299,000)	$ (19,619,000)