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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
 
March 31, 2018
 
December 31, 2017
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
2021 Senior unsecured notes
$
372,712

 
$
377,071

 
$
372,618

 
$
381,657



Assets and liabilities measured at fair value on a recurring basis are summarized below:
 
Level 2
 
March 31, 2018
 
December 31, 2017
Commodity derivative contracts, net
$
82

 
$
(72
)