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Financial instruments (Tables) | 3 Months Ended
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Mar. 31, 2019
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 March 31, 2019 and December 31, 2018:
| March 31, 2019 |  | December 31, 2018
| Fair Value
| (Dollars in thousands)
Asset derivatives: |  |  |
Designated foreign currency forward contracts | $ | 883 |  |  | $ | 1,216 |
Non-designated foreign currency forward contracts | 264 |  |  | 106 |
Cross-currency interest rate swap | 23,129 |  |  | 14,728 |
Prepaid expenses and other current assets | 24,276 |  |  | 16,050 |
Cross-currency interest rate swap | 11 |  |  | — |
Other assets | 11 |  |  | — |
Total asset derivatives | 24,287 |  |  | 16,050 |
Liability derivatives: |  |  |
Designated foreign currency forward contracts | 1,054 |  |  | 524 |
Non-designated foreign currency forward contracts | 533 |  |  | 264 |
Other current liabilities | 1,587 |  |  | 788 |
Cross-currency interest rate swap | 3,713 |  |  | 7,793 |
Other liabilities | 3,713 |  |  | 7,793 |
Total liability derivatives | $ | 5,300 |  |  | $ | 8,581 |

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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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