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Restructuring - Activity Related to Restructuring and Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended			8 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Additions charged to expense	$ 1,376	$ 239	$ 49,000		$ 3,679	$ 14,563
Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Beginning balance				$ 0	2,348
Additions charged to expense				14,213	3,679
Cash payments				(10,783)	(4,534)
Ending balance	1,493	3,430		3,430	1,493	3,430
Severance and other benefits \| Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Beginning balance				0	1,481
Additions charged to expense				11,633	2,515
Cash payments				(8,265)	(2,784)
Ending balance	1,212	3,368		3,368	1,212	3,368
Professional fees and other related charges \| Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Beginning balance				0	867
Additions charged to expense				2,580	1,164
Cash payments				(2,518)	(1,750)
Ending balance	$ 281	$ 62		$ 62	$ 281	$ 62