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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivatives designated and not designated as hedging instruments
Settlements of derivative commodity instruments are reported as a component of cash flows from operations in the accompanying Statements of Condensed Consolidated Cash Flows. 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(Thousands)
Commodity derivatives designated as cash flow hedges
 
Amount of gain reclassified from accumulated OCI, net of tax, into operating revenues (effective portion)
$
1,672

 
$
15,940

 
$
2,560

 
$
28,364

 
 
 
 
 
 
 
 
Interest rate derivatives designated as cash flow hedges
 

 
 

 
 
 
 
Amount of loss reclassified from accumulated OCI, net of tax, into interest expense (effective portion)
$
(36
)
 
$
(36
)
 
$
(72
)
 
$
(72
)
 
 
 
 
 
 
 
 
Derivatives not designated as hedging instruments
 

 
 

 
 

 
 

Amount of gain (loss) recognized in operating revenues
$
46,326

 
$
(234,693
)
 
$
187,068

 
$
(125,698
)
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 as of June 30, 2017 and December 31, 2016. 
As of June 30, 2017
 
Derivative
instruments,
recorded in the
Condensed
Consolidated
Balance
Sheet, gross
 
Derivative
instruments
subject to
master
netting
agreements
 
Margin
deposits
remitted to
counterparties
 
Derivative
instruments, net
 
 
(Thousands)
Asset derivatives:
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
85,442

 
$
(49,465
)
 
$
—

 
$
35,977

Liability derivatives:
 
 
 
 
 
 

 
 

Derivative instruments, at fair value
 
$
107,880

 
$
(49,465
)
 
$
—

 
$
58,415

As of December 31, 2016
 
Derivative
instruments,
recorded in the
Condensed
Consolidated
Balance
Sheet, gross
 
Derivative
instruments
subject to 
master
netting
agreements
 
Margin
deposits
remitted to
counterparties
 
Derivative
instruments, net
 
 
(Thousands)
Asset derivatives:
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
33,053

 
$
(23,373
)
 
$
—

 
$
9,680

Liability derivatives:
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
257,943

 
$
(23,373
)
 
$
—

 
$
234,570
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 as of June 30, 2017 and December 31, 2016. 
As of June 30, 2017
 
Derivative
instruments,
recorded in the
Condensed
Consolidated
Balance
Sheet, gross
 
Derivative
instruments
subject to
master
netting
agreements
 
Margin
deposits
remitted to
counterparties
 
Derivative
instruments, net
 
 
(Thousands)
Asset derivatives:
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
85,442

 
$
(49,465
)
 
$
—

 
$
35,977

Liability derivatives:
 
 
 
 
 
 

 
 

Derivative instruments, at fair value
 
$
107,880

 
$
(49,465
)
 
$
—

 
$
58,415

As of December 31, 2016
 
Derivative
instruments,
recorded in the
Condensed
Consolidated
Balance
Sheet, gross
 
Derivative
instruments
subject to 
master
netting
agreements
 
Margin
deposits
remitted to
counterparties
 
Derivative
instruments, net
 
 
(Thousands)
Asset derivatives:
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
33,053

 
$
(23,373
)
 
$
—

 
$
9,680

Liability derivatives:
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
257,943

 
$
(23,373
)
 
$
—

 
$
234,570