SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Summary of Estimated Fair Value for Financial instruments
A summary of the estimated fair value for financial instruments follows.
 
December 31, 2013
 
December 31, 2012
 
Carrying value
 
Estimated
fair value (Level 2)
 
Carrying value
 
Estimated
fair value (Level 2)
 
(In thousands)
Revolving credit facility
$
286,000

 
$
286,000

 
$
199,230

 
$
199,230

Senior notes
300,000

 
314,625

 
—

 
—
Deferred Revenue, by Arrangement, Disclosure
A rollforward of current and noncurrent deferred revenue follows.
 
Current
 
Noncurrent
 
(In thousands)
Deferred revenue, January 1, 2012
$
—

 
$
1,770

Additions
865

 
9,129

Deferred revenue, December 31, 2012
865

 
10,899

Additions (1)
1,555

 
18,784

Less: revenue recognized due to expiration
865

 
—

Deferred revenue, December 31, 2013
$
1,555

 
$
29,683

__________
(1) Noncurrent includes amounts recognized in connection with the Bison Drop Down.