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Fair Value Disclosures (Tables)
3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of fair value measurements
The following sets forth, by level within the hierarchy, the fair value of our assets and liabilities measured at fair value as of March 31, 2015 and December 31, 2014 (in thousands):
 
 
Level 1
 
Level 2
 
Level 3
 
 
March 31, 2015
 
 
 
 
 
Assets and Liabilities Measured at Fair Value on a Recurring Basis
 
 
 
 
 
Derivative financial instruments- asset
$

 
$
36,645

 
$

Derivative financial instruments- liability

 
(5,893
)
 

Derivative deferred premiums - liability

 

 
(3,545
)
Net financial assets
$

 
$
30,752

 
$
(3,545
)
 
 
 
 
 
 
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
 
 
 
 
 
Asset retirement obligations
$

 
$

 
$
21

 
 
 
 
 
 
December 31, 2014
 
 
 
 
Assets and Liabilities Measured at Fair Value on a Recurring Basis
 
 
 
 
 
Derivative financial instruments- asset
$

 
$
27,044

 
$

Derivative financial instruments- liability

 

 

Net financial assets
$

 
$
27,044

 
$

 
 
 
 
 
 
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
 
 
 
 
 
Asset retirement obligations
$

 
$

 
$
3,171

Impairment of proved oil and natural gas properties
$

 
$

 
$
30,206

Schedule of changes in Level 3 fair value measurements
A summary of the changes in Level 3 fair value measurements for the periods presented are as follows:
 
 
Three Months Ended 
 March 31, 2015
 
Year Ended  
 December 31, 2014
 
 
(in thousands)
Balance of Level 3 at beginning of period
 
$

 
$

Derivative deferred premiums - purchases
 
(4,068
)
 

Derivative deferred premiums - settlements
 
523

 

Balance of Level 3 at end of period
 
$
(3,545
)
 
$