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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Offsetting 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
Consolidated Balance Sheet
 
Derivative instruments
subject to master
netting agreements
 
Margin deposits
remitted to
counterparties
 
Net derivative
instruments
December 31, 2019
(Thousands)
Asset derivative instruments at fair value
$
812,664

 
$
(226,116
)
 
$
—

 
$
586,548

Liability derivative instruments at fair value
312,696

 
(226,116
)
 
(12,606
)
 
73,974

 
 
 
 
 
 
 
 
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
Offsetting 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
Consolidated Balance Sheet
 
Derivative instruments
subject to master
netting agreements
 
Margin deposits
remitted to
counterparties
 
Net derivative
instruments
December 31, 2019
(Thousands)
Asset derivative instruments at fair value
$
812,664

 
$
(226,116
)
 
$
—

 
$
586,548

Liability derivative instruments at fair value
312,696

 
(226,116
)
 
(12,606
)
 
73,974

 
 
 
 
 
 
 
 
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