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Financial instruments Aggregate accounts receivable, net of allowance for doubtful accounts (Details) (Spain, Italy, Portugal, and Greece, USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2014 | Dec. 31, 2013
Spain, Italy, Portugal, and Greece |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current and long-term accounts receivable (net of allowances of $8.9 million and $7.9 million at September 28, 2014 and December 31, 2013, respectively) in Spain, Italy, Greece and Portugal (1) | $ 87,733,000 | [1] | $ 97,852,000 | [1]
Percentage of total net current and long-term accounts receivable | 29.40% |  | 31.00% |
Current and long term accounts receivable, allowances | 8,900,000 |  | 7,900,000 |
Long-term portion of accounts receivable, net | $ 15,500,000 |  | $ 17,600,000 |
[1] | The long-term portion of accounts receivable, net at September 28, 2014 and December 31, 2013 was $15.5 million and $17.6 million, respectively.

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