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Fair Value Measurement of Assets and Liabilities (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Financial Assets $ 1,757,865 $ 917,796
Contingent considerations 2,135 2,097
Long-term retention plan 49,207 42,625
Derivative Instruments 1,030  
Total Financial Liabilities 52,372 44,722
Firm Commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Assets 1,030  
Derivative Instruments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Assets 69  
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Financial Assets 1,756,761 917,771
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Financial Assets 5 25
Long-term retention plan 49,207 42,625
Total Financial Liabilities 49,207 42,625
Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Financial Assets 1,099  
Contingent considerations 2,135 2,097
Derivative Instruments 1,030  
Total Financial Liabilities 3,165 2,097
Unobservable Inputs (Level 3) [Member] | Firm Commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Assets 1,030  
Unobservable Inputs (Level 3) [Member] | Derivative Instruments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Assets 69  
Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents 168,741 179,252
Restricted Cash and cash equivalents 9,591 24,363
Money Market Funds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents 168,741 179,252
Restricted Cash and cash equivalents 9,591 24,363
Central Bank of Brazil Mandatory Guarantee [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 339,299 284,317
Central Bank of Brazil Mandatory Guarantee [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 339,299 284,317
Sovereign Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,238,880 429,602
Sovereign Debt Securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,238,880 429,602
Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 255 262
Corporate Debt Securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 250 237
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 5 $ 25