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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured on Recurring Basis
The following tables summarize the Company’s assets and liabilities measured at fair value on a recurring basis by the fair value hierarchy (in thousands):

September 30, 2018
Fair Value Measurements
Netting(1)
Assets/Liabilities at Fair Value
Level 1
Level 2
Level 3
Assets
Commodity derivative contracts
$— $224 $— $(151)$73 
$— $224 $— $(151)$73 
Liabilities 
Commodity derivative contracts
$— $43,847 $— $(151)$43,696 
$— $43,847 $— $(151)$43,696 

December 31, 2017
Fair Value Measurements
Netting(1)
Assets/Liabilities at Fair Value
Level 1
Level 2
Level 3
Assets
Commodity derivative contracts
$— $5,582 $— $(4,272)$1,310 
Investments
5,072 — — — 5,072 
$5,072 $5,582 $— $(4,272)$6,382 
Liabilities
Commodity derivative contracts
$— $18,467 $— $(4,272)$14,195 
$— $18,467 $— $(4,272)$14,195 
____________________
1. Represents the effect of netting assets and liabilities for counterparties with which the right of offset exists.
Long-Term Debt Carrying Value and Fair Value Table The estimated fair values and carrying values of the Company’s long-term debt are as follows (in thousands):
September 30, 2018December 31, 2017
Fair Value
Carrying Value
Fair Value
Carrying Value
Building Note
$— $— $42,526 $37,502