Disposed and Discontinued Operations - Statement of Operations for Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disposed and Discontinued Operations
Cost of sales									$ (901)	$ (88)
Total operating expense									1,022	96
Operating income (loss) from discontinued operations									(121)	(8)
Other income (expense)										(24)
Other income (expense)									10,895
Income (loss) from discontinued operations before income taxes									10,774	(32)
Provision (benefit) for income taxes									2,294	6
Income (loss) from discontinued operations, net of income taxes	$ (210)	$ 375	$ 8,324	$ (9)	$ 188	$ (371)	$ 5	$ 140	$ 8,480	$ (38)	$ 1,760