Non-operating (loss) income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Non-operating (loss) income, net [Abstract]
Interest Income	$ 2,274	$ 7,228	$ 6,695	$ 14,588
income from transition services	0	4,050	2,100	8,100
Gain (Loss) on Disposition of Business	5,153	43	5,611	753
Other Nonoperating Income (Expense)	(24)	115	81	198
Nonoperating (loss) Income	$ 7,403	$ 11,436	$ 14,487	$ 23,639