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Financial Risk Management (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 | Jan. 01, 2018 USD ($)
Statement Line Items [Line Items] |  |  |  |  |  |
Debt to equity ratio |  | 0.04 | 0.08 |  |  |
Foreign exchange risk, currency exposure |  | $ 3,600,000 | $ 5,300,000 |  |  |
Reserve of exchange differences on translation |  | 1,900,000 | 3,400,000 |  |  |
Total borrowings |  | 539,007,000 | 965,859,000 |  |  |
Gain (loss) on interest rate risk if market interest rates were higher |  | (8,200,000) | (8,000,000) |  |  |
Current trade receivables |  | $ 1,737,366,000 | $ 1,214,060,000 |  |  | $ 1,214,060,000
Liquid financial assets, percentage |  | 7.00% | 11.00% |  |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period |  | $ 0 |  |  |  |
Financial liabilities, fair value as a percentage of carrying value |  | 99.30% | 99.40% |  |  |
Reserve of cash flow hedges, continuing hedges |  | $ (900,000) | $ (200,000) |  |  |
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period |  | $ 0 |  |  |  |
UNITED STATES |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Liquid financial assets, percentage denominated by a specific currency |  | 95.00% | 93.00% |  |  |
Allowance for doubtful accounts - trade receivables [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Other provisions at end of period |  | $ 66,500,000 | $ 78,400,000 |  |  |
Past due [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Current trade receivables |  | 368,400,000 | 230,900,000 |  |  |
Past due up to 15 days [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Current trade receivables |  | 139,000,000 | 50,000,000 |  |  |
Past due over 15 days [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Current trade receivables |  | 229,400,000 | 180,900,000 |  |  |
Guarantees under credit insurance [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Current trade receivables |  | 181,700,000 | 190,700,000 |  |  |
Letter of credit and other bank guarantees [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Current trade receivables |  | 62,300,000 | 42,200,000 |  |  |
Other guarantees [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Current trade receivables |  | 42,200,000 | 14,100,000 |  |  |
Financial guarantee contracts [member] | Past due [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Current trade receivables |  | 31,500,000 | 27,300,000 |  |  |
Fixed interest rate [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Total borrowings |  | 520,471,000 | $ 946,215,000 | [1] |  |
Current borrowings |  | $ 493,000,000 |  |  |  |
Concentration Risk, percentage | [1] | 97.00% | 98.00% |  |  |
Foreign exchange derivatives contracts [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Foreign exchange risk, currency exposure |  | $ 2,300,000 | $ 6,700,000 |  |  |
One percent change, Argentine Peso / U.S. dollar foreign exchange risk [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Foreign exchange risk, currency exposure |  | 1,900,000 | 600,000 |  |  |
One percent change, Euro / U.S. dollar foreign exchange risk [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Foreign exchange risk, currency exposure |  | 1,300,000 | $ 3,700,000 |  |  |
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 |  | 83.00% | 71.00% |  |  |
[1] | Out of the $520 million fixed rate borrowings $493 million are short-term.

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