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Derivatives (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Offsetting Assets and Liabilities
The following tables summarize (i) the Company's commodity derivative contracts on a gross basis, (ii) the effects of netting assets and liabilities for which the right of offset exists based on master netting arrangements and (iii) for the Company’s net derivative liability positions, the applicable portion of shared collateral under the credit facility as of December 31, 2018 and 2017 (in thousands):

December 31, 2018
Gross Amounts Gross Amounts Offset Amounts Net of OffsetFinancial Collateral Net Amount 
Assets 
Derivative contracts - current
$5,286 $— $5,286 $— $5,286 
Total
$5,286 $— $5,286 $— $5,286 

December 31, 2017 
Gross Amounts Gross Amounts Offset Amounts Net of OffsetFinancial Collateral Net Amount 
Assets 
Derivative contracts - current
$5,582 $(4,272)$1,310 $— $1,310 
Total
$5,582 $(4,272)$1,310 $— $1,310 
Liabilities 
Derivative contracts - current
$14,899 $(4,272)$10,627 $(10,627)$— 
Derivative contracts - noncurrent
3,568 — 3,568 (3,568)— 
Total
$18,467 $(4,272)$14,195 $(14,195)$— 
Open Oil and Natural Gas Commodity Derivative Contracts
At December 31, 2018, the Company’s open commodity derivative contracts consisted of the following:

Natural Gas Price Swaps 
Notional (MMcf)
Weighted Average
Fixed Price
January 2019 - March 20194,500 $4.28 
Fair Value of Derivative Contracts
The following table presents the fair value of the Company’s derivative contracts on a gross basis without regard to same-counterparty netting (in thousands):
December 31,December 31,
Type of Contract Balance Sheet Classification 20182017
Derivative assets 
Natural gas price swapsDerivative contracts - current$5,286 $5,582 
Derivative liabilities 
Oil price swapsDerivative contracts - current— (14,899)
Oil price swapsDerivative contracts - noncurrent— (3,568)
Total net derivative contracts $5,286 $(12,885)