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Commitments and Contingencies - Other Loss Contingencies (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 12, 2014 | Apr. 30, 2013 | Dec. 31, 2017 USD ($) defendant | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 27, 2017 | Jul. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Long-term indemnification assets |  |  | $ 98,493 | $ 97,607 | $ 2,084 |  | $ 2,084
UAM Brazil |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, noncontrolling owners, ownership percent |  | 49.00% |  |  |  |  |
Brazil |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Estimate of possible contingency loss |  |  | 55,000 |  |  |  |
Repayment Guarantee for Loans that Financed a Portion of the Purchase Price |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of shares as guarantee of payment obligations | 75.00% |  |  |  |  |  |
Repayment Guarantee for Obligations Under the Purchase Agreement for the Seller Notes |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of shares as guarantee of payment obligations | 25.00% |  |  |  |  |  |
Pending Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contingent liabilities recorded |  |  | $ 22,000 | 18,000 |  |  |
Pending Litigation | Hunan International Economics University (HIEU) |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of defendants (defendant) | defendant |  |  | 5 |  |  |  |
Pending Litigation | Hunan International Economics University (HIEU) | Financial Guarantee |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Guarantor obligations, amount of loan |  |  | $ 29,000 |  |  |  |
Taxes, Other-Than-Income Tax |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency, statues of limitations |  |  | 10 years |  |  |  |
Taxes, Other-Than-Income Tax And Indemnification Assets |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Increases/(decreases) to operating income for adjustments to non-income tax contingencies and indemnification assets |  |  | $ 2,883 | (17,360) | $ (182) |  |
Income Tax Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contingent liabilities recorded |  |  | 100,404 | 103,471 |  |  |
Guarantee of Indebtedness of Others | Chile |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency, noncurrent |  |  | 27,073 | 20,636 |  |  |
Guarantee amount, maximum potential amount of payments |  |  | 527,000 | 479,000 |  |  |
Guarantee Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percent of shares of company acquired in a business combination, used as a guarantee |  | 49.00% |  |  |  |  |
Other Noncurrent Liabilities | Taxes, Other-Than-Income Tax |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency, noncurrent |  |  | 74,318 | 67,192 |  |  |
Other Current Liabilities | Taxes, Other-Than-Income Tax |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency, current liability |  |  | $ 138 | $ 1,896 |  |  |
Hunan Lie Ying Industry Co., Ltd | LEI Lie Ying Limited |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  | 70.00% |

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