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Fair Value Measurements (Tables)
6 Months Ended
Jun. 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):

June 30, 2018

Fair Value Measurements Netting(1) Assets/Liabilities at Fair Value 
Level 1 Level 2 Level 3 
Assets 
Commodity derivative contracts $— $1,079 $— $(1,079)$— 
$— $1,079 $— $(1,079)$— 
Liabilities 
Commodity derivative contracts $— $45,004 $— $(1,079)$43,925 
$— $45,004 $— $(1,079)$43,925 


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 
Investments5,072 — — — 5,072 
$5,072 $5,582 $— $(4,272)$6,382 
Liabilities 
Commodity derivative contracts$— $18,467 $— $(4,272)$14,195 
$— $18,467 $— $(4,272)$14,195 
____________________
1. Represents the effect of netting assets and liabilities for counterparties with which the right of offset exists.
Long-Term Debt Carrying Amount and Fair Value Table The estimated fair values and carrying values of the Company’s long-term debt are as follows (in thousands):
June 30, 2018December 31, 2017
Fair Value Carrying Value Fair Value Carrying Value 
Building Note$— $— $42,526 $37,502