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Accounts And Other Receivables (Schedule Of Reconciliation Of The Beginning And Ending Balances Of The Allowance For Doubtful Accounts And Sales Returns) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Accounts and other receivables, net of allowance for doubtful accounts and sales returns of $3,036 in 2019 and $2,937 in 2018 | $ 107,558 | $ 124,727 |
Accounts and other receivables, allowance for doubtful accounts and sales returns | 3,036 | 2,937 |
Customer receivables | 110,594 | 127,664 |
Allowance For Doubtful Accounts |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance, beginning of year | 2,937 | 3,304 | $ 3,102
Charges to expense | 1,188 | 553 | 2,369
Recoveries | (38) | (56) | (857)
Write-offs and settlements | (974) | (710) | (1,322)
Foreign exchange and other | (77) | (154) | 12
Balance, end of year | $ 3,036 | $ 2,937 | $ 3,304

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4531-111522 + Details
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