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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2015
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on a recurring basis during the applicable period
The following assets and liabilities were measured at fair value on a recurring basis during the applicable period:
 
 
 
 
Fair value measurements at reporting date using
Description
 
As of September 30, 2015
 
Quoted prices in
active markets for
identical assets
(Level 1)
 
Significant
other observable
inputs
(Level 2)
 
Significant
unobservable
inputs
(Level 3)
 
 
(Thousands)
Assets
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
395,264

 
$
—

 
$
395,264

 
$
—

 
 
 
 
 
 
 
 
 
Liabilities
 
 

 
 

 
 
 
 

Derivative instruments, at fair value (included in other current liabilities)
 
$
26,057

 
$
—

 
$
26,057

 
$
—


 
 
 
 
Fair value measurements at reporting date using
Description
 
As of December 31, 2014
 
Quoted prices in
active markets for
identical assets
(Level 1)
 
Significant
other observable
inputs
(Level 2)
 
Significant
unobservable
inputs
(Level 3)
 
 
(Thousands)
Assets
 
 

 
 

 
 

 
 

Derivative instruments, at fair value
 
$
458,460

 
$
—

 
$
458,460

 
$
—

 
 
 
 
 
 
 
 
 
Liabilities
 
 

 
 

 
 

 
 

Derivative instruments, at fair value (included in other current liabilities)
 
$
22,942

 
$
132

 
$
22,810

 
$
—