Charges Related To Restructuring Activities (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 7,027,000
Charges	1,392,000	$ 692,000
Payments	(1,870,000)	(1,225,000)
Ending Balance	6,549,000
Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	7,023,000
Charges	1,319,000
Payments	(1,797,000)
Ending Balance	6,545,000
Contract Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	4,000
Charges	73,000
Payments	(73,000)
Ending Balance	4,000
All Other
Restructuring Reserve [Roll Forward]
Beginning Balance	406,000
Charges	36,000	(181,000)
Payments	(276,000)
Ending Balance	166,000
All Other \| Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	406,000
Charges	36,000	(181,000)
Payments	(276,000)
Ending Balance	166,000
All Other \| Contract Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Charges	0
Payments	0
Ending Balance	0
Europe
Restructuring Reserve [Roll Forward]
Beginning Balance	6,410,000
Charges	665,000	320,000
Payments	(1,032,000)
Ending Balance	6,043,000
Europe \| Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	6,406,000
Charges	592,000	320,000
Payments	(959,000)
Ending Balance	6,039,000
Europe \| Contract Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	4,000
Charges	73,000
Payments	(73,000)
Ending Balance	4,000
North America
Restructuring Reserve [Roll Forward]
Beginning Balance	211,000
Charges	691,000	553,000
Restructuring Reserve, Accrual Adjustment	691,000
Payments	(562,000)
Ending Balance	340,000
North America \| Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	211,000
Charges	691,000	531,000
Payments	(562,000)
Ending Balance	340,000
North America \| Contract Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Charges		$ 22,000
Restructuring Reserve, Accrual Adjustment	0
Payments	0
Ending Balance	$ 0

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.

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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

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

Reference 3: 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=109223946&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 420
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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