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Financial instruments - Aggregate accounts receivable, net of allowance for doubtful accounts (Details) - USD ($) $ in Thousands | Sep. 25, 2016 | Dec. 31, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for doubtful accounts receivable | $ 9,000 | $ 8,000
Spain, Italy, Portugal, and Greece |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for doubtful accounts receivable | 8,000 | 7,200
Current and long-term trade accounts receivable (net of allowances of $8.0 million and $7.2 million at September 25, 2016 and December 31, 2015, respectively) in Greece, Italy, Spain and Portugal (1) | $ 59,785 | $ 62,272
Percentage of total net current and long-term trade accounts receivable - Greece, Italy, Spain and Portugal | 22.90% | 23.90%
Long-term portion of accounts receivable, net | $ 7,700 | $ 8,100

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