Non-operating (loss) income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Non-operating (loss) income, net [Abstract]
Gain (Loss) on Extinguishment of Debt	$ 0	$ 0	$ (2,149)	$ 0
Interest Income	111	805	438	7,500
Gain (Loss) on Disposition of Business	0	(9)	0	5,602
income from transition services	0	0	0	2,100
Other Nonoperating Income (Expense)	53	(21)	278	60
Nonoperating (loss) Income	$ 164	$ 775	$ (1,433)	$ 15,262