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Commitments and Contingencies - Indemnification and loss contingencies (Details) $ in Thousands | Jan. 13, 2016 | Oct. 09, 2015 complaint | Jul. 28, 2015 | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2015 USD ($)
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Indemnification clauses |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Liabilities accrued |  |  |  | $ 0 |  |
Office of Foreign Assets Control |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Transaction Period | 5 years |  |  |  |  |
Liabilities accrued |  |  |  |  |  | $ 900
Loss contingency accrual reversed |  |  |  |  | $ 900 |
Range of potential penalties assessed |  |  |  | $ 0 |  |
Beth Seltzer v. Hunt, et al. |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Number of new claims filed | complaint |  | 2 |  |  |  |
Pending Litigation | Putative Class Action Complaint |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Number of days allowed to file amended complaint |  |  | 60 days |  |  |

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