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Restructuring Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Restructuring Reserve
Beginning balance	$ 7,861	$ 7,322	$ 8,039	$ 2,573	$ 3,223	$ 4,766
Charges	619	720	(322)
Cash paid	(66)	(274)	(43)	(862)	(708)	(1,431)
Foreign currency translation adjustment	(211)	93	(352)	115	58	(112)
Ending balance	8,203	7,861	7,322	1,826	2,573	3,223
Personnel Expenses
Restructuring Reserve
Beginning balance	2,715	3,041	3,559	2,372	2,805	3,400
Charges	(1)	(323)	(322)
Cash paid	0	(49)	(43)	(814)	(486)	(514)
Foreign currency translation adjustment	(69)	46	(153)	108	53	(81)
Ending balance	2,645	2,715	3,041	1,666	2,372	2,805
Demolition and Removal Costs
Restructuring Reserve
Beginning balance	0	219	229	76	148	561
Charges	0	0	0
Cash paid	0	(225)	0	0	(74)	(402)
Foreign currency translation adjustment	0	6	(10)	3	2	(11)
Ending balance	0	0	219	79	76	148
Ground Remediation Costs
Restructuring Reserve
Beginning balance	5,146	4,062	4,251	76	222	488
Charges	620	1,043	0
Cash paid	(66)	0	0	(48)	(148)	(252)
Foreign currency translation adjustment	(142)	41	(189)	2	2	(14)
Ending balance	5,558	5,146	4,062	30	76	222
Other
Restructuring Reserve
Beginning balance	0	0	0	49	48	317
Charges	0	0	0
Cash paid	0	0	0	0	0	(263)
Foreign currency translation adjustment	0	0	0	2	1	(6)
Ending balance	$ 0	$ 0	$ 0	$ 51	$ 49	$ 48

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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-Publisher FASB
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-Section 45
-Paragraph 17
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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
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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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-Publisher FASB
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- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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