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Financial instruments (Tables) | 9 Months Ended
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Sep. 25, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Values of Derivative Instruments Designated as Hedging Instruments | The following table presents the location and fair value of derivative financial instruments reported in the condensed consolidated balance sheet as of September 25, 2016 and December 31, 2015:
| September 25, 2016 |  | December 31, 2015
| Fair Value |  | Fair Value
| (Dollars in thousands)
Asset derivatives: |  |  |
Designated foreign currency forward contracts | $ | 615 |  |  | $ | 285 |
Non-designated foreign currency forward contracts | 519 |  |  | 44 |
Prepaid expenses and other current assets | $ | 1,134 |  |  | $ | 329 |
Total asset derivatives | $ | 1,134 |  |  | $ | 329 |
Liability derivatives: |  |  |
Designated foreign currency forward contracts | $ | 2,369 |  |  | $ | 807 |
Non-designated foreign currency forward contracts | 34 |  |  | 491 |
Other current liabilities | $ | 2,403 |  |  | $ | 1,298 |
Total liability derivatives | $ | 2,403 |  |  | $ | 1,298 |
After Tax Gain (Loss) Recognized in OCI | The following table provides information as to the gains and losses attributable to derivatives in cash flow hedging relationships that were reported in other comprehensive income (loss) (“OCI”) for the three and nine months ended September 25, 2016 and September 27, 2015:
| After Tax Gain (Loss) Recognized in OCI
| Three Months Ended |  | Nine Months Ended
| September 25, 2016 |  | September 27, 2015 |  | September 25, 2016 |  | September 27, 2015
| (Dollars in thousands)
Foreign currency forward contracts | $ | (223 | ) |  | $ | (730 | ) |  | $ | 761 |  |  | $ | (1,489 | )
Aggregate Accounts Receivable, Net of Allowance for Doubtful Accounts | The aggregate net current and long-term trade accounts receivable for customers in Greece, Italy, Spain and Portugal and the percentage of the Company’s total net current and long-term trade accounts receivable represented by the net current and long-term trade accounts receivable for customers in those countries at September 25, 2016 and December 31, 2015 are as follows:
| September 25, 2016 |  | December 31, 2015
| (Dollars in thousands)
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 | 22.9 | % |  | 23.9 | %
(1) The long-term portion of trade accounts receivable, net from customers in Greece, Italy, Spain and Portugal at September 25, 2016 and December 31, 2015 was $7.7 million and $8.1 million, respectively, and is reported on the condensed consolidated balance sheet in other assets.

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + 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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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