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Financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The following table presents the locations in the consolidated balance sheets and fair value of derivative instruments as of December 31, 2017 and 2016:
| December 31, 2017 |  | December 31, 2016
| Fair Value
| (Dollars in thousands)
Asset derivatives: |  |  |
Designated foreign currency forward contracts | $ | 914 |  |  | $ | 667 |
Non-designated foreign currency forward contracts | 307 |  |  | 490 |
Prepaid expenses and other current assets | 1,221 |  |  | 1,157 |
Total asset derivatives | 1,221 |  |  | 1,157 |
Liability derivatives: |  |  |
Designated foreign currency forward contracts | 1,373 |  |  | 2,139 |
Non-designated foreign currency forward contracts | 53 |  |  | 118 |
Other current liabilities | 1,426 |  |  | 2,257 |
Total liability derivatives | $ | 1,426 |  |  | $ | 2,257 |
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 December 31, 2017 and 2016 are as follows:
| December 31, 2017 |  | December 31, 2016
| (Dollars in thousands)
Current and long-term trade accounts receivable in Greece, Italy, Spain and Portugal (1) | $ | 49,054 |  |  | $ | 51,098 |
Percentage of total net current and long-term trade accounts receivables | 14.6 | % |  | 19.3 | %
(1) The long-term portion of trade accounts receivable, net from customers in Greece, Italy, Spain and Portugal at December 31, 2017 and 2016 was $3.3 million and $2.7 million, respectively. In January 2017, the Company sold $16.1 million of receivables outstanding with publicly funded hospitals in Italy for $16.0 million.

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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 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=64837297&loc=SL5624163-113959 + Details
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