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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Commodity derivatives designated as cash flow hedges
(Thousands)
Amount of loss recognized in OCI (effective portion), net of tax
$
—

 
$
(13,455
)
 
$
—

 
$
(52,649
)
Amount of gain reclassified from accumulated OCI, net of tax, into gain on sale / exchange of assets due to forecasted transactions probable to not occur
—

 
16,735

 
—

 
16,735

Amount of gain (loss) reclassified from accumulated OCI, net of tax, into operating revenues (effective portion)
42,581

 
(10,883
)
 
83,332

 
(28,146
)
Amount of gain (loss) recognized in operating revenues (ineffective portion) (a)
—

 
987

 
—

 
(21,273
)
 
 
 
 
 
 
 
 
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 gain (loss) on derivatives not designated as hedges
$
4,259

 
$
(8,525
)
 
$
47,851

 
$
(17,879
)

(a)   No amounts were excluded from effectiveness testing of cash flow hedges.
Schedule of impact of netting agreements and margin deposits on gross derivative assets and liabilities
The table below reflects the impact of netting agreements and margin deposits on gross derivative assets and liabilities as of June 30, 2015 and December 31, 2014. 
As of June 30, 2015
 
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
 
$
349,152

 
$
(27,724
)
 
$
—

 
$
321,428

 
 
 
 
 
 
 
 
 
Liability derivatives:
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
43,696

 
$
(27,724
)
 
$
—

 
$
15,972

As of December 31, 2014
 
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
 
$
458,460

 
$
(22,810
)
 
$
—

 
$
435,650

 
 
 
 
 
 
 
 
 
Liability derivatives:
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
22,942

 
$
(22,810
)
 
$
(132
)
 
$
—