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Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |
Impairment charges on minority investments | $ 0 | $ 2,361,000 |
Carrying amount of cost method investments | 5,632,000 | 5,016,000 |
Finite lives impairment charge | 0 | 0 |
Foreign currency gain (loss) included in net income | 1,681,000 | (4,762,000) | $ (2,287,000)
Advertising costs | $ 5,486,000 | $ 7,561,000 | $ 13,732,000
Lease renewal term | 1 year |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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