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Schedule Of Valuation And Qualifying Accounts (Details) - Allowance for doubtful accounts [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 1,733,000 | $ 105,000 | $ 2,838,000
Charges to Operatons | 10,323,000 | 1,718,000 | 1,697,000
Other additions | 0 | 0 | 0
Deductions | 1,971,000 | 90,000 | 4,430,000
Balance at end of period | $ 10,085,000 | $ 1,733,000 | $ 105,000

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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