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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - Fair value measured on recurring basis - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Trading securities $ 11,572 $ 10,636
Derivative asset 0  
Derivative liability 0 0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Trading securities 141 256
Derivative asset 1,214  
Derivative liability 15,412 49,703
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Trading securities 0 0
Derivative asset 0  
Derivative liability 0 0
Estimate of Fair Value Measurement    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Trading securities 11,713 10,892
Derivative asset 1,214  
Derivative liability 15,412 49,703
Money Market Funds | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Money market funds 0 0
Money Market Funds | SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Money market funds 9,186 62,657
Money Market Funds | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Money market funds 0 0
Money Market Funds | Estimate of Fair Value Measurement    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Money market funds 9,186 62,657
Bank Time Deposits | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Money market funds 0 0
Bank Time Deposits | SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Money market funds 2,175 2,121
Bank Time Deposits | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Money market funds 0 0
Bank Time Deposits | Estimate of Fair Value Measurement    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Money market funds $ 2,175 $ 2,121