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Venezuelan operations (Details) number in Thousands, $ in Thousands | 11 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Aug. 20, 2018 / $ | Aug. 19, 2018 / $ | Jun. 01, 2018 USD ($) | Feb. 05, 2018 / $
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |
Revenue from Venezuelan operations |  | $ 78,859 | $ 101,477 | $ 51,615 |  |  |  |
Operating income (loss) from Venezuelan operations |  | (52,054) | $ 6,804 | $ (8,608) |  |  |  |
Non-monetary assets |  |  |  |  |  |  | $ 20 |
Venezuela |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |
Foreign currency exchange rate |  |  |  |  |  |  | 600 |
Impairment of long-lived assets |  | 12,089 |  |  |  |  |  |
NEW DICOM | Venezuela |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |
Exchange rate at System date change | / $ |  |  |  |  |  |  |  | 25,000.00
Foreign currency exchange rate | / $ |  |  |  |  | 5,993,000 | 248,000 |  |
Foreign currency exchange loss | $ (6,100) |  |  |  |  |  |  |
Write down of inventories | 23,000 |  |  |  |  |  |  |
Net liability | 100 | 100 |  |  |  |  |  |
Non-monetary assets | $ 16,800 | $ 16,800 |  |  |  |  |  |

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