XML 54 R34.htm IDEA: XBRL DOCUMENT v3.10.0.1
Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of fair value of the derivatives recorded in the consolidated balance sheets
   Fair Value
at
December 31,
 
   2017 
Current commodity derivative liability  $32,186 
Long-term commodity derivative liability   11,420 
Total derivative liability  $43,606 
Summary of open derivative positions outstanding
Type     Term     Volume
Hedged (Dth)
    Index     Fixed Price ($/Dth)  
  Swap       March 2015 - February 2019       95,000       NYM-LDS     $ 3.82