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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Accounting Policies [Line Items] |  |  |  |
Impairment charges on minority investments |  | $ 1,743 | $ 1,210 |
Aggregate carrying investment amount |  | 8,263 | 9,116 |
Redeemable noncontrolling interests |  | 8,872 | 8,872 |
Finite lives impairment charge | $ 93,520 | 0 | 0 | $ 93,520
Advertising costs |  | 13,683 | 12,469 | 15,245
Retained earnings |  | $ (677,772) | $ (621,787) |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Sale payment period |  | 30 days |  |
Ownership of companies, percent |  | 20.00% |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Sale payment period |  | 60 days |  |
Ownership of companies, percent |  | 50.00% |  |
Americas [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Fair value of goodwill | $ 0 |  |  | 0
Goodwill impairment |  |  |  | $ 382,271
EMEA [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Carrying value of goodwill exceeds fair value, percent | 29.00% |  |  | 29.00%
Goodwill impairment |  |  |  | $ 61,388

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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