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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Fair Value Measurements (Details) - Fair value measured on recurring basis - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Quoted prices in active markets (Level 1)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Trading securities $ 10,504 $ 10,168
Derivative Assets 0  
Derivative Liabilities 0 0
Significant other observable inputs (Level 2)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Trading securities 484 564
Derivative Assets 3,326  
Derivative Liabilities 24,404 9,756
Significant unobservable inputs (Level 3)    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Trading securities 0 0
Derivative Assets 0  
Derivative Liabilities 0 0
Estimate of Fair Value Measurement    
Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis [Line Items]    
Trading securities 10,988 10,732
Derivative Assets 3,326  
Derivative Liabilities 24,404 9,756
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 763,780 13,653
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 $ 763,780 $ 13,653