Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring Charges - By type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring charges
Charges incurred	$ 2,900	$ 0	$ 7,036	$ 0
Organizational Restructuring
Restructuring charges
Charges incurred	(33)		1,695
Pandemic Restructuring
Restructuring charges
Charges incurred	1,435		3,843
Property Restructuring
Restructuring charges
Loss on sale	915		915
Impairment loss	583		583
Charges incurred	1,498		1,498
Severance costs
Restructuring charges
Charges incurred	1,402		5,538
Severance costs \| Organizational Restructuring
Restructuring charges
Charges incurred	(33)		1,695
Severance costs \| Pandemic Restructuring
Restructuring charges
Charges incurred	1,435		3,843
Property restructuring \| Property Restructuring
Restructuring charges
Loss on sale	915		915
Impairment loss	583		583
Charges incurred	$ 1,498		$ 1,498