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Financial instruments (Tables) | 6 Months Ended
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Jul. 01, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Values of Derivative Instruments Designated as Hedging Instruments | The following table presents the locations in the condensed consolidated balance sheet and fair value of derivative financial instruments as of July 1, 2018 and December 31, 2017:
| July 1, 2018 |  | December 31, 2017
| Fair Value
| (Dollars in thousands)
Asset derivatives: |  |  |
Designated foreign currency forward contracts | $ | 1,513 |  |  | $ | 914 |
Non-designated foreign currency forward contracts | 441 |  |  | 307 |
Prepaid expenses and other current assets | $ | 1,954 |  |  | $ | 1,221 |
Total asset derivatives | $ | 1,954 |  |  | $ | 1,221 |
Liability derivatives: |  |  |
Designated foreign currency forward contracts | $ | 759 |  |  | $ | 1,373 |
Non-designated foreign currency forward contracts | 102 |  |  | 53 |
Other current liabilities | $ | 861 |  |  | $ | 1,426 |
Total liability derivatives | $ | 861 |  |  | $ | 1,426 |
Aggregate Accounts Receivable, Net of Allowance for Doubtful Accounts | The following table provides information regarding the Company's allowance for doubtful accounts, the aggregate net current and long-term trade accounts receivable related to 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 these customers' trade accounts receivable at July 1, 2018 and December 31, 2017:
| July 1, 2018 |  | December 31, 2017
| (Dollars in thousands)
Allowance for doubtful accounts (1) | $ | 9,525 |  |  | $ | 10,255 |
Current and long-term trade accounts receivable, net in Greece, Italy, Spain and Portugal (2) | $ | 52,569 |  |  | $ | 49,054 |
Percentage of total net current and long-term trade accounts receivable - Greece, Italy, Spain and Portugal | 15.0 | % |  | 14.6 | %
(1) The current portion of the allowance for doubtful accounts was $3.6 million and $3.5 million as of July 1, 2018 and December 31, 2017, respectively, and was recognized in accounts receivable, net.
(2) | The long-term portion of trade accounts receivable, net from customers in Greece, Italy, Spain and Portugal at July 1, 2018 and December 31, 2017 was $3.5 million and $3.3 million, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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