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Financial instruments - Aggregate accounts receivable, net of allowance for doubtful accounts (Details) - USD ($) $ in Thousands | Jul. 01, 2018 | Dec. 31, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for doubtful accounts receivable | $ 9,525 | $ 10,255
Allowance for doubtful accounts receivable, current | 3,600 | 3,500
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 | $ 52,569 | $ 49,054
Percentage of total net current and long-term trade accounts receivable - Greece, Italy, Spain and Portugal | 15.00% | 14.60%
Long-term portion of accounts receivable, net | $ 3,500 | $ 3,300

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