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Restructuring charges - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Apr. 14, 2020	Mar. 15, 2017	Mar. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 25,396	$ 1,454	$ 22,743
Operating Lease, Impairment Loss				12,460	0	0
First quarter 2017 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated		17.00%
Restructuring charges			$ 23,100
Other Restructuring Costs				(57)	1,395	4,783
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			12,800
First quarter 2017 restructuring [Member] | Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs			$ 10,300	0	$ 0	$ 0
Second quarter 2020 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated	20.00%
Restructuring charges				25,500
Other Restructuring Costs				5,800
Second quarter 2020 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				5,800
Second quarter 2020 restructuring [Member] | Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs				$ 7,287

X

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Amount of loss from impairment of right-of-use asset from operating lease.

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