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Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May 27, 2016 | Nov. 09, 2011 | Dec. 31, 2017 | Dec. 31, 2016
Axionlog Distribution B.V. [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revolving loan, related parties, borrowing capacity |  | $ 12,000 |  |
Revolving loan maturity date |  |  | Nov. 07, 2016 |
Proceeds from related party debt | $ 1,800 |  |  |
Accounts payable, related party |  |  | $ 11,727 | $ 10,355
Lacoop, A.C. And Lacoop II, S. C. [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other receivables, related party |  |  | 2,112 | 1,315
Accounts payable, related party |  |  | $ 1,113 | $ 1,299
LIBOR [Member] | Axionlog Distribution B.V. [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  | 6.00% |  |

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