Restructuring Expenses - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 9,961	$ 0	$ 4,346
Q1-Q2 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Unpaid balance related to restructuring plan	600
Q1-Q2 2020 Restructuring Plan | Employee Severance Costs and Related Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 10,000
Q4 2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			1,300
Restructuring payments			1,300
Q1 2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			$ 3,000