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Financial Risk Management (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Statement Line Items [Line Items] |  |  |  |  |
Debt to equity ratio |  | 0.08 | 0.07 |  |
Foreign exchange risk, currency exposure |  | $ 5,300 | $ 6,600 |  |
Reserve of exchange differences on translation |  | 3,400 | 4,200 |  |
Total borrowings |  | 965,859 | 840,236 |  |
Gain (loss) on interest rate risk if market interest rates were higher |  | $ (8,000) | $ (8,800) |  |
Concentration Risk, percentage |  |  |  |  |
Current trade receivables |  | $ 1,214,060 | $ 954,685 |  |
Liquid financial assets, percentage |  | 11.00% | 16.00% |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period |  | $ 0 |  |  |
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period |  | $ 0 |  |  |
Financial assets, fair value as a percentage of carrying value |  | 100.90% | 100.80% |  |
Financial liabilities, fair value as a percentage of carrying value |  | 99.40% | 99.70% |  |
Reserve of cash flow hedges, continuing hedges |  | $ 200 | $ (4,700) |  |
UNITED STATES |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Liquid financial assets, percentage denominated by a specific currency |  | 93.00% | 95.00% |  |
Allowance for doubtful accounts - trade receivables [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Other provisions at end of period |  | $ 78,385 | $ 85,724 |  | $ 101,480
Past due [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Current trade receivables |  | 230,900 | 249,000 |  |
Guarantees under credit insurance [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Current trade receivables |  | 190,700 | 222,100 |  |
Letter of credit and other bank guarantees [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Current trade receivables |  | 42,200 | 117,800 |  |
Other guarantees [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Current trade receivables |  | 14,100 | 15,600 |  |
Financial guarantee contracts [member] | Past due [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Current trade receivables |  | 27,300 | 83,100 |  |
Fixed interest rate [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Total borrowings |  | $ 946,215 | $ 820,600 | [1] |
Concentration Risk, percentage | [1] | 98.00% | 98.00% |  |
Fixed interest rate [member] | Current Borrowings [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Total borrowings |  | $ 913,000 |  |  |
Foreign exchange derivatives contracts [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Foreign exchange risk, currency exposure |  | 6,700 | $ 4,000 |  |
One percent change, Argentine Peso / U.S. dollar foreign exchange risk [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Foreign exchange risk, currency exposure |  | (600) | (600) |  |
One percent change, Euro / U.S. dollar foreign exchange risk [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Foreign exchange risk, currency exposure |  | (3,700) | (4,100) |  |
One percent change, U.S. dollar / Brazilian Real foreign exchange risk [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Foreign exchange risk, currency exposure |  |  | 1,300 |  |
One percent change, U.S. dollar / Brazilian Real foreign exchange risk [member] | Foreign exchange derivatives contracts [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Foreign exchange risk, currency exposure |  |  | $ 500 |  |
Customer concentration risk [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Credit exposure |  | $ 0 |  |  |
Concentration Risk, percentage |  | 0.00% | 0.00% |  | 0.00%
Counterparty risk [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Concentration Risk, percentage |  | 71.00% | 82.00% |  |
[1] | Out of the $946 Million fixed rate borrowings $913 Million are short-term.

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