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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Significant Accounting Policies [Line Items] |  |  |  |
Impairment charges on minority investments |  | $ 1 | $ 7,432 |
Aggregate carrying investment amount | $ 10,687 | 9,116 | 10,687 |
Goodwill impairment |  | 0 | 443,659 | $ 0
Finite lives impairment charge | $ 93,520 | 0 | 93,520 | 0
Advertising costs |  | $ 12,469 | 15,245 | $ 8,799
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] |  |  |  |
Warranty period |  | 1 year |  |
Sale payment period |  | 60 days |  |
Ownership of companies, percent |  | 50.00% |  |
Americas [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Fair value of goodwill |  | $ 0 |  |
Goodwill impairment |  | $ 382,271 | 382,271 |
Finite lives impairment charge |  |  | 92,248 |
Other EMEA [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Carrying value of goodwill exceeds fair value, percent |  | 29.00% |  |
Goodwill impairment |  | $ 61,388 | 61,388 |
Finite lives impairment charge |  |  | $ 1,272 |

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