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Venezuelan Operations (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) / $ | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | May 31, 2017 / $
Foreign Operations Disclosure [Line Items] |  |  |  |
Revenue from Venezuelan operations | $ 101,477 | $ 51,615 | $ 40,898 |
Operating income (loss) from Venezuelan operations | 6,804 | $ (8,608) | (28,329) |
Impairment of long-lived assets | $ 8,563 |  | $ 7,804 |
DICOM II [Member] | Venezuela [Member] |  |  |  |
Foreign Operations Disclosure [Line Items] |  |  |  |
Foreign currency exchange rate (in VEF per USD) | / $ | 3,345 |  |  | 2,010

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