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Restructuring Charges - By type (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring charges
Restructuring charges	$ 313	$ 2,900		$ 1,953	$ 7,036
Organizational Restructuring
Restructuring charges
Restructuring charges		(33)			1,695
Pandemic Restructuring
Restructuring charges
Restructuring charges	224	1,435		1,717	3,843
Property Restructuring
Restructuring charges
Loss on sale		915			915
Impairment loss		583		9	583
Other exit costs				26
Restructuring charges	19	1,498		35	1,498
Other Restructuring
Restructuring charges
Restructuring charges	70			201
Severance costs
Restructuring charges
Restructuring charges	224	1,402		1,717	5,538
Severance costs | Organizational Restructuring
Restructuring charges
Restructuring charges		(33)	$ 1,700		1,695
Severance costs | Pandemic Restructuring
Restructuring charges
Restructuring charges	224	1,435		1,717	3,843
Property disposal costs | Property Restructuring
Restructuring charges
Loss on sale		915			915
Impairment loss		583		9	583
Other exit costs	19			26
Restructuring charges	19	$ 1,498		35	$ 1,498
Other restructuring costs
Restructuring charges
Restructuring charges	$ 70			$ 201

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- Definition

Amount of expenses for impairment associated exit or disposal activities pursuant to an authorized plan.

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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