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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Fair value of senior notes
Based upon quoted market prices as of December 31, 2015, the fair value and carrying value of our senior notes was as follows (in millions):
 
Predecessor
As of December 31, 2015
 
Fair Value
 
Carrying Value
7.125% senior notes due 2017
$
23.0

 
$
250.0

8.875% senior notes due 2020 (1)
$
21.4

 
$
225.0

7.875% senior notes due 2022 (1)
$
34.5

 
$
400.0

(1) Includes write-off of discount associated with the 2020 notes and premium associated with the 2022 notes due to the Company's bankruptcy proceedings.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value (in millions):
 
Fair Value Measurements at
 
Total
 
Quoted Prices in
Active markets for
Identical Assets
(Level 1)
 
Significant Other
Observable Inputs
 (Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
June 30, 2016
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
   Natural Gas Basis Derivatives
$
0.2

 
$
—

 
$
0.2

 
$
—

Liabilities
 
 
 
 
 
 
 
   Natural Gas Derivatives
7.5

 
—

 
7.5

 
—

   Natural Gas Basis Derivatives
0.2

 
—

 
0.2

 
—

   Oil Derivatives
$
2.0

 
$
—

 
$
2.0

 
$
—