Restructuring Charges - Restructuring Program (Details) $ in Thousands		3 Months Ended	6 Months Ended
	Jul. 10, 2020 employee	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Restructuring Charges
Restructuring expenses		$ 192	$ 4,043	$ 1,580
2020 Restructuring Plan
Restructuring Charges
Positions eliminated estimate | employee	80
Work force positions reduced (as a percent)	8.50%
Restructuring expenses			4,000
Expected cost savings			15,000
2020 Restructuring Plan | Employee Separation Costs
Restructuring Charges
Restructuring expenses			$ 4,043