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FAIR VALUE MEASUREMENTS AND DISCLOSURES Fair Value Measurements and Disclosures (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The following table presents, for each applicable level within the fair value hierarchy, our derivative assets and liabilities, including both current and non-current portions, measured at fair value on a recurring basis:
 
As of December 31,
 
2017
 
2016
 
Significant Other
Observable
Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
  
Total
 
Significant Other
Observable
Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
  
Total
 
(in thousands)
Total assets
$
12,949

 
$
1,389

 
$
14,338

 
$
6,350

 
$
4,827

 
$
11,177

Total liabilities
90,569

 
11,076

 
101,645

 
66,789

 
14,401

 
81,190

Net liability
$
(77,620
)
 
$
(9,687
)
 
$
(87,307
)
 
$
(60,439
)
 
$
(9,574
)
 
$
(70,013
)
 
 
 
 
 
 
 
 
 
 
 
 
Fair Value Assets and Liabilities Unobservable Input Reconciliation [Table Text Block]
The following table presents a reconciliation of our Level 3 commodity derivative instruments measured at fair value:


 
2017
 
2016
 
2015

 
(in thousands)

 
 
 
 
 
 
Fair value of Level 3 instruments, net asset (liability) beginning of period
 
$
(9,574
)
 
$
91,288

 
$
62,356

Changes in fair value included in consolidated statements of operations line item:
 
 
 
 
 
 
Commodity price risk management gain (loss), net
 
6,241

 
(28,550
)
 
65,164

Settlements included in consolidated statements of operations line items:
 
 
 
 
 
 
Commodity price risk management (loss), net
 
(6,354
)
 
(72,312
)
 
(36,232
)
Fair value of Level 3 instruments, net asset (liability) end of period
 
$
(9,687
)
 
$
(9,574
)
 
$
91,288

 
 
 
 
 
 
 
Net change in fair value of Level 3 unsettled derivatives included in consolidated statements of operations line item:
 
 
 
 
 
 
Commodity price risk management gain (loss), net
 
$
(866
)
 
$
(12,905
)
 
$
43,540

Total
 
$
(866
)
 
$
(12,905
)
 
$
43,540

 
 
 
 
 
 
 
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
The portion of our long-term debt related to our revolving credit facility approximates fair value due to the variable nature of related interest rates. We have not elected to account for the portion of our debt related to our senior notes under the fair value option; however, we have determined an estimate of the fair values based on measurements of trading activity and broker and/or dealer quotes, respectively, which are published market prices, and therefore are Level 2 inputs. The table below presents these estimates of the fair value of the portion of our long-term debt related to our senior notes and convertible notes as of December 31, 2017:
 
Estimated Fair Value
 
% of Par
 
(in millions)
 
 
Senior notes:
 
 
 
2021 Convertible Notes
$
195.6

 
97.8
%
     2024 Senior Notes
416.0

 
104.0
%
2026 Senior Notes
616.5

 
102.8
%