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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of impact of netting agreements and margin deposits on gross derivative assets The table below reflects the impact of netting agreements and margin deposits on gross derivative assets and liabilities.
 
 
Gross derivative instruments, recorded in the Condensed Consolidated Balance Sheets
 
Derivative instruments subject to master netting agreements
 
Margin deposits remitted to counterparties
 
Derivative instruments, net
 
 
(Thousands)
As of September 30, 2019
 
 
 
 
 
 
 
 
Asset derivative instruments, at fair value
 
$
771,634

 
$
(288,898
)
 
$
—

 
$
482,736

Liability derivative instruments, at fair value
 
$
339,995

 
$
(288,898
)
 
$
(23,372
)
 
$
27,725

 
 
 
 
 
 
 
 
 
As of December 31, 2018
 
 
 
 
 
 
 
 
Asset derivative instruments, at fair value
 
$
481,654

 
$
(256,087
)
 
$
—

 
$
225,567

Liability derivative instruments, at fair value
 
$
336,051

 
$
(256,087
)
 
$
(40,283
)
 
$
39,681
Schedule of impact of netting agreements and margin deposits on gross derivative liabilities The table below reflects the impact of netting agreements and margin deposits on gross derivative assets and liabilities.
 
 
Gross derivative instruments, recorded in the Condensed Consolidated Balance Sheets
 
Derivative instruments subject to master netting agreements
 
Margin deposits remitted to counterparties
 
Derivative instruments, net
 
 
(Thousands)
As of September 30, 2019
 
 
 
 
 
 
 
 
Asset derivative instruments, at fair value
 
$
771,634

 
$
(288,898
)
 
$
—

 
$
482,736

Liability derivative instruments, at fair value
 
$
339,995

 
$
(288,898
)
 
$
(23,372
)
 
$
27,725

 
 
 
 
 
 
 
 
 
As of December 31, 2018
 
 
 
 
 
 
 
 
Asset derivative instruments, at fair value
 
$
481,654

 
$
(256,087
)
 
$
—

 
$
225,567

Liability derivative instruments, at fair value
 
$
336,051

 
$
(256,087
)
 
$
(40,283
)
 
$
39,681