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Financial instruments - Aggregate accounts receivable, net of allowance for doubtful accounts (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2017 | Jul. 02, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for doubtful accounts receivable |  | $ 9,813 | $ 8,630
Allowance for doubtful accounts |  | 2,700 | 2,000
Spain, Italy, Portugal, and Greece |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Current and long-term trade accounts receivable in Greece, Italy, Spain and Portugal |  | $ 51,896 | $ 51,098
Percentage of total net current and long-term trade accounts receivable - Greece, Italy, Spain and Portugal |  | 17.50% | 19.30%
Long-term portion of accounts receivable, net |  | $ 3,000 | $ 2,700
Italy |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, significant sales | $ 16,100 |  |
Proceeds from sale of receivables | $ 16,000 |  |

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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + 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(3)) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(9)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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