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Commitments and Contingencies - Other Loss Contingencies (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Sep. 12, 2014
Apr. 30, 2013
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Loss Contingencies [Line Items]          
Long-term indemnification assets     $ 116,944   $ 98,493
UAM Brazil          
Loss Contingencies [Line Items]          
Noncontrolling interest, noncontrolling owners, ownership percent   49.00%      
Brazil          
Loss Contingencies [Line Items]          
Estimate of possible contingency loss     46,000    
Pending Litigation          
Loss Contingencies [Line Items]          
Contingent liabilities recorded     $ 60,000   22,000
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     $ (2,121) $ (4,037)  
Income Tax Contingencies          
Loss Contingencies [Line Items]          
Contingent liabilities recorded     64,380   100,404
Guarantee of Indebtedness of Others | Chile          
Loss Contingencies [Line Items]          
Loss contingency, noncurrent     33,575   27,073
Guarantee amount, maximum potential amount of payments     545,000   527,000
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     76,112   74,318
Other Current Liabilities | Taxes, Other-Than-Income Tax          
Loss Contingencies [Line Items]          
Loss contingency, current liability     $ 142   $ 138
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%