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Commitments and Contingencies (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) claim | Dec. 31, 2017 USD ($)
Value-added tax assessments and other civil litigation |  |
Commitments and contingencies |  |
Minimum number of claims that the Company's insurance coverage may not be sufficient to cover | claim | 1 |
Accrued liabilities | $ 1,200,000 | $ 1,500,000
Provision for losses | 0 |
Non-Income Tax Contingencies |  |
Commitments and contingencies |  |
Accrued liabilities | 200,000 | 400,000
Minimum | Value-added tax assessments and other civil litigation |  |
Commitments and contingencies |  |
Estimate of possible loss | 0 |
Minimum | Non-Income Tax Contingencies |  |
Commitments and contingencies |  |
Estimate of possible loss |  | $ 0
Maximum | Value-added tax assessments and other civil litigation |  |
Commitments and contingencies |  |
Estimate of possible loss | 2,000,000 |
Maximum | Non-Income Tax Contingencies |  |
Commitments and contingencies |  |
Estimate of possible loss | $ 3,900,000 |

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