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Restructuring Charges - By segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 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
Corporate
Restructuring charges
Restructuring charges	313	1,730	1,192	3,090
Corporate | Organizational Restructuring
Restructuring charges
Restructuring charges		(13)		612
Corporate | Pandemic Restructuring
Restructuring charges
Restructuring charges	224	245	956	980
Corporate | 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
Corporate | Other Restructuring
Restructuring charges
Restructuring charges	$ 70		201
Contract Operations | Operating
Restructuring charges
Restructuring charges		526	616	2,390
Contract Operations | Operating | Organizational Restructuring
Restructuring charges
Restructuring charges		(20)		458
Contract Operations | Operating | Pandemic Restructuring
Restructuring charges
Restructuring charges		546	616	1,932
Aftermarket Services | Operating
Restructuring charges
Restructuring charges		644	145	1,556
Aftermarket Services | Operating | Organizational Restructuring
Restructuring charges
Restructuring charges				625
Aftermarket Services | Operating | Pandemic Restructuring
Restructuring charges
Restructuring charges		$ 644	$ 145	$ 931

X

- Definition

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

+ References

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- Definition

Amount of expenses for loss on sale associated with exit or disposal activities pursuant to an authorized plan.

+ References

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- Definition

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
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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- Definition

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
-Topic 420
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Section S99
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-Name Accounting Standards Codification
-Topic 230
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-Name Accounting Standards Codification
-Topic 420
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-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(1))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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