Goodwill And Intangible Assets (Changes In The Carrying Value Of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Gross carrying value, Beginning	$ 34,062
Currency translation	(373)
Gross carrying value, Ending	33,689
Accumulated impairment losses, Beginning	(23,161)
Accumulated impairment losses, Ending	(23,161)
Net carrying value	10,528	$ 10,901
United States [Member]
Goodwill [Line Items]
Gross carrying value, Beginning	19,786
Currency translation
Gross carrying value, Ending	19,786
Accumulated impairment losses, Beginning	(19,786)
Accumulated impairment losses, Ending	(19,786)
Net carrying value
Canada [Member]
Goodwill [Line Items]
Gross carrying value, Beginning	7,385
Currency translation	50
Gross carrying value, Ending	7,435
Accumulated impairment losses, Beginning	(3,375)
Accumulated impairment losses, Ending	(3,375)
Net carrying value	4,060	4,010
Poland [Member]
Goodwill [Line Items]
Gross carrying value, Beginning	6,891
Currency translation	(423)
Gross carrying value, Ending	6,468
Accumulated impairment losses, Beginning
Accumulated impairment losses, Ending
Net carrying value	$ 6,468	$ 6,891

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
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-Section 45
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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