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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments
The effect of derivative instruments in cash flow hedging relationships on the Consolidated Statements of Income and the Consolidated Statements of Stockholders' Equity net of tax were as follows:

 
 
 
For the Three Months Ended June 30,
 
2014
 
2013
Natural Gas Price Swaps and Options
 
 
 
Beginning Balance – Accumulated OCI

$
11,841

 
$
35,453

(Loss)/Gain recognized in Accumulated OCI
(12,218
)
 
45,749

Less: (Loss)/Gain reclassified from Accumulated OCI into Natural Gas, NGL's and Oil Sales
(6,951
)
 
9,528

Ending Balance – Accumulated OCI

$
6,574

 
$
71,674

Gain/(Loss) recognized in Natural Gas, NGL's and Oil Sales for ineffectiveness 
$
508

 
$
(3,753
)


 
 
 
For the Six Months Ended June 30,
 
2014
 
2013
Natural Gas Price Swaps and Options
 
 
 
Beginning Balance – Accumulated OCI

$
42,493

 
$
76,761

(Loss)/Gain recognized in Accumulated OCI
(59,183
)
 
27,154

Less: (Loss)/Gain reclassified from Accumulated OCI into Natural Gas, NGL's and Oil Sales
(23,264
)
 
32,241

Ending Balance – Accumulated OCI

$
6,574

 
$
71,674

Gain/(Loss) recognized in Natural Gas, NGL's and Oil Sales for ineffectiveness 
$
863

 
$
(2,712
)


There were no amounts excluded from the assessment of hedge effectiveness in 2014 or 2013.