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Derivative Financial Instruments Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair value of derivative assets and liabilities    
Derivative, fair value, net $ 137,900 $ 158,300
Derivative assets, current 143,142 175,130
Derivative assets, noncurrent 38,571 58,499
Total derivative assets 181,713 233,629
Derivative liabilities, current 37,798 62,853
Derivatives liabilities, noncurrent 6,014 12,496
Total derivative liabilities 43,812 75,349
Derivative asset, amounts not offset in the accompanying balance sheets (43,812) (56,041)
Derivative liabilities, amounts not offset in the accompanying balance sheets 43,812 56,041
Derivative asset, fair value, net amounts 137,901 177,588
Derivative liabilities, fair value, net amounts 0 (19,308)
Not Designated as Hedging Instrument [Member]    
Fair value of derivative assets and liabilities    
Derivative assets, current 143,142 175,130
Derivative assets, noncurrent 38,571 58,499
Derivative liabilities, current 37,798 62,853
Derivatives liabilities, noncurrent 6,014 12,496
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]    
Fair value of derivative assets and liabilities    
Total derivative assets 181,713 [1] 233,629 [2]
Total derivative liabilities $ 43,812 [1] $ 75,349 [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.