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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on a recurring basis
The table below summarizes assets and liabilities measured at fair value on a recurring basis.
 
 
 
Fair value measurements at reporting date using
 
Gross derivative instruments recorded in the Consolidated Balance Sheets
 
Quoted prices in active markets 
for identical assets
(Level 1)
 
Significant other
observable inputs
(Level 2)
 
Significant unobservable inputs
(Level 3)
December 31, 2019
(Thousands)
Asset derivative instruments at fair value
$
812,664

 
$
95,041

 
$
717,623

 
$
—

Liability derivative instruments at fair value
312,696

 
71,107

 
241,589

 
—

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

 
$
112,107

 
$
369,547

 
$
—

Liability derivative instruments at fair value
336,051

 
126,582

 
209,469

 
—