Non-operating (loss) income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Non-operating (loss) income, net [Abstract]
Gain (Loss) on Extinguishment of Debt	$ (2,149)	$ 0	$ (2,149)	$ 0
Interest Income	111	2,274	327	6,695
Gain (Loss) on Disposition of Business	0	5,153	0	5,611
income from transition services	0	0	0	2,100
Other Nonoperating Income (Expense)	(3)	(24)	225	81
Nonoperating (loss) Income	$ (2,041)	$ 7,403	$ (1,597)	$ 14,487