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Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets    
Derivatives $ 181,713 $ 233,629
Liabilities    
Derivatives 43,812 75,349
Not Designated as Hedging Instrument [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets    
Derivatives 0 [1] 0 [2]
Liabilities    
Derivatives 0 [1] 0 [2]
Not Designated as Hedging Instrument [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets    
Derivatives 181,713 [1] 233,629 [2]
Liabilities    
Derivatives 43,812 [1] 75,349 [2]
Not Designated as Hedging Instrument [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets    
Derivatives 0 [1] 0 [2]
Liabilities    
Derivatives $ 0 [1] $ 0 [2]
[1]
(1) 
This represents a financial asset or liability that is measured at fair value on a recurring basis.
[2]
(1) 
This represents a financial asset or liability that is measured at fair value on a recurring basis.