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Venezuelan operations (Affect of Foreign Currency Translation) (Details) - Venezuela $ in Thousands | 3 Months Ended | 8 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended | 13 Months Ended | 15 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2014 USD ($) / $ | Jan. 31, 2018 USD ($) / $ | Feb. 28, 2015 USD ($) / $ | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Mar. 09, 2016 USD ($) / $ | Feb. 28, 2014 USD ($) / $ | May 30, 2017 USD ($) / $ | Feb. 05, 2018 / $
Official exchange rate |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Exchange rate at System date change | / $ |  |  |  |  |  |  | 6.30 |  |
Official exchange rate | Other Operating Income (Expense) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Write down of inventories |  |  |  |  |  |  | $ 0 |  |
Impairment of long-lived assets |  |  |  |  |  |  | 0 |  |
Official exchange rate | Foreign Currency Gain (Loss) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency exchange loss |  |  |  |  |  |  | $ 15,379 |  |
SICAD |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Exchange rate at System date change | / $ | 11.80 |  |  |  |  |  |  |  |
SICAD | Other Operating Income (Expense) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Write down of inventories | $ 7,611 |  |  |  |  |  |  |  |
Impairment of long-lived assets | 0 |  |  |  |  |  |  |  |
SICAD | Foreign Currency Gain (Loss) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency exchange loss | $ 19,697 |  |  |  |  |  |  |  |
SICAD II |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Exchange rate at System date change | / $ |  |  | 49.98 |  |  |  |  |  |
SICAD II | Other Operating Income (Expense) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Write down of inventories |  |  | $ 9,937 |  |  |  |  |  |
Impairment of long-lived assets |  |  | 45,186 |  |  |  |  |  |
SICAD II | Foreign Currency Gain (Loss) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency exchange loss |  |  | $ 38,963 |  |  |  |  |  |
SIMADI |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Exchange rate at System date change | / $ |  |  |  |  |  | 177.00 |  |  |
SIMADI | Other Operating Income (Expense) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Write down of inventories |  |  |  |  |  | $ 3,250 |  |  |
Impairment of long-lived assets |  |  |  |  |  | 7,804 |  |  |
SIMADI | Foreign Currency Gain (Loss) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency exchange loss |  |  |  |  |  | $ 8,046 |  |  |
DICOM |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Exchange rate at System date change | / $ |  |  |  |  |  |  |  | 215.34 |
DICOM | Other Operating Income (Expense) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Write down of inventories |  |  |  |  |  |  |  | $ 401 |
Impairment of long-lived assets |  |  |  |  |  |  |  | 0 |
DICOM | Foreign Currency Gain (Loss) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency exchange loss |  |  |  |  |  |  |  | $ 117 |
DICOM II |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Exchange rate at System date change | / $ |  | 2,010.00 |  |  |  |  |  |  |
DICOM II | Other Operating Income (Expense) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Write down of inventories |  | $ 1,375 |  |  |  |  |  |  |
Impairment of long-lived assets |  | 0 |  |  |  |  |  |  |
DICOM II | Foreign Currency Gain (Loss) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency exchange loss |  | $ 2,554 |  |  |  |  |  |  |
NEW DICOM |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Exchange rate at System date change | / $ |  |  |  |  |  |  |  |  | 25,000.00
Write down of inventories |  |  |  |  | $ 23,000 |  |  |  |
Foreign currency exchange loss |  |  |  |  | $ 6,100 |  |  |  |
NEW DICOM | Other Operating Income (Expense) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Write down of inventories |  |  |  | $ 38,095 |  |  |  |  |
Impairment of long-lived assets |  |  |  | 0 |  |  |  |  |
NEW DICOM | Foreign Currency Gain (Loss) |  |  |  |  |  |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency exchange loss |  |  |  | $ (11,223) |  |  |  |  |

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