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Commitments and Contingencies - Litigation (Details) - Court of Ouargla Foreign Currency Controls - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2011 | Dec. 31, 2017 | Dec. 31, 2006
Commitments and Contingencies, Disclosure |  |  |
Litigation amount as per judgment | $ 24.6 |  |
Payment of contract amount in foreign currency |  |  | $ 7.5
Payment of contract amount in domestic currency |  |  | $ 3.2
Maximum |  |  |
Commitments and Contingencies, Disclosure |  |  |
Potential judgment in excess of accrual |  | $ 16.6 |

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- Definition Represents the payment of contract amount in domestic currency. + References No definition available. + Details
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- Definition Potential judgment in excess of accrual related to foreign currency exchange control. + References No definition available. + Details
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- Details
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