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Commitments and Contingencies - Litigation (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2016 USD ($) | Dec. 31, 2006 USD ($) | Mar. 31, 2011 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Mar. 19, 2012 USD ($)
Commitments and Contingencies, Disclosure |  |  |  |  |  |  |  |  |
Litigation amount as per judgment |  |  |  |  |  | $ 16,500 |  |  |
Pretax settlement charge |  |  |  | $ (2,387) | $ 2,327 | $ (777) | $ 2,651 |  |
Court of Ouargla Foreign Currency Controls |  |  |  |  |  |  |  |  |
Commitments and Contingencies, Disclosure |  |  |  |  |  |  |  |  |
Litigation amount as per judgment |  |  | $ 25,000 |  |  |  |  |  |
Payment of contract amount in foreign currency |  | $ 7,500 |  |  |  |  |  |  |
Payment of contract amount in domestic currency |  | $ 3,200 |  |  |  |  |  |  |
Approximate multiplier of the amount at issue for fines and penalties |  |  |  |  |  | 4 |  |  |
Court of Ouargla Foreign Currency Controls | Maximum |  |  |  |  |  |  |  |  |
Commitments and Contingencies, Disclosure |  |  |  |  |  |  |  |  |
Potential judgment in excess of accrual |  |  |  |  |  | $ 17,000 |  |  |
NGH2L |  |  |  |  |  |  |  |  |
Commitments and Contingencies, Disclosure |  |  |  |  |  |  |  |  |
Pretax settlement charge |  |  |  | $ 16,500 |  | 16,500 |  |  |
Escrow Deposit |  |  |  |  |  |  |  |  | $ 3,000
NGH2L | ERG Member |  |  |  |  |  |  |  |  |
Commitments and Contingencies, Disclosure |  |  |  |  |  |  |  |  |
Payments for settlement | $ 20,000 |  |  |  |  |  |  |  |
NGH2L | ERG Member | Parax |  |  |  |  |  |  |  |  |
Commitments and Contingencies, Disclosure |  |  |  |  |  |  |  |  |
Monetary damages sought based on alleged breach of contract by NGH2L and alleged tortious interference with contractual relations by Parex | $ 15,000 |  |  |  |  |  |  |  |
NGH2L | ERG Member | Maximum |  |  |  |  |  |  |  |  |
Commitments and Contingencies, Disclosure |  |  |  |  |  |  |  |  |
Potential recovery |  |  |  |  |  |  |  | $ 4,500 |
Monetary damages sought based on alleged breach of contract by NGH2L and alleged tortious interference with contractual relations by Parex |  |  |  |  |  | $ 750,000 |  |  |

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