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Commodity Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of Fair Value and Classification of Derivative Instruments
The tables below summarize the fair value and classification of the Partnership’s derivative instruments, as well as the gross recognized derivative assets, liabilities, and amounts offset in the consolidated balance sheets as of each date: 
As of December 31, 2019
ClassificationBalance Sheet Location
Gross Fair
Value
Effect of
Counterparty Netting
Net Carrying
Value on
Balance Sheet
  (in thousands)
Assets:    
       Current assetCommodity derivative assets$19,028  $(4,238) $14,790  
       Long-term assetDeferred charges and other long-term assets713  (105) 608  
          Total assets $19,741  $(4,343) $15,398  
Liabilities:          
       Current liabilityCommodity derivative liabilities$4,397  $(4,238) $159  
       Long-term liabilityCommodity derivative liabilities123  (105) 18  
         Total liabilities $4,520  $(4,343) $177  
  
As of December 31, 2018
ClassificationBalance Sheet Location
Gross Fair
Value
Effect of
Counterparty Netting
Net Carrying
Value on
Balance Sheet
  (in thousands)
Assets:    
       Current assetCommodity derivative assets$38,746  $(776) $37,970  
       Long-term assetDeferred charges and other long-term assets11,518  (1,450) 10,068  
          Total assets $50,264  $(2,226) $48,038  
Liabilities:    
       Current liabilityCommodity derivative liabilities$776  $(776) $—  
       Long-term liabilityCommodity derivative liabilities1,450  (1,450) —  
          Total liabilities $2,226  $(2,226) $—  
Changes in Fair Value of Company's Commodity Derivative Instruments Changes in the fair values of the Partnership’s derivative instruments (both assets and liabilities) are presented on a net basis in the accompanying consolidated statements of operations and consolidated statements of cash flows and consist of the following for the periods presented:
 For the year ended December 31,
Derivatives not designated as hedging instruments201920182017
 (in thousands)
Beginning fair value of commodity derivative instruments$48,038  $(5,028) $(16,719) 
Gain (loss) on oil derivative instruments(34,728) 24,300  (5,091) 
Gain (loss) on natural gas derivative instruments29,773  (9,469) 31,993  
Net cash paid (received) on settlements of oil derivative instruments(8,536) 34,905  (10,901) 
Net cash paid (received) on settlements of natural gas derivative instruments(19,326) 3,330  (4,310) 
Net change in fair value of commodity derivative instruments(32,817) 53,066  11,691  
Ending fair value of commodity derivative instruments$15,221  $48,038  $(5,028) 
Summary of Open Derivative Contracts
The Partnership had the following open derivative contracts for oil as of December 31, 2019:
 Volume (Bbl)Weighted Average Price (per Bbl)Range (per Bbl)
Period and Type of ContractLowHigh
Oil Swap Contracts:    
2019
Fourth quarter312,000  $58.50  $52.82  $63.75  
2020    
First quarter630,000  $57.32  $54.92  $58.65  
Second quarter630,000  57.32  54.92  58.65  
Third quarter630,000  57.32  54.92  58.65  
Fourth quarter630,000  57.32  54.92  58.65  

 Volume (Bbl)Weighted Average Floor Price (Per Bbl)Weighted Average Ceiling Price (Per Bbl)
Period and Type of Contract
Oil Collar Contracts:   
2019
Fourth quarter20,000  $65.00  $74.00  
2020         
First quarter210,000  $56.43  $67.14  
Second quarter210,000  56.43  67.14  
Third quarter210,000  56.43  67.14  
Fourth quarter210,000  56.43  67.14  

The Partnership had the following open derivative contracts for natural gas as of December 31, 2019:
 Volume (MMBtu)Weighted Average Price (per MMBtu)Range (per MMBtu)
Period and Type of ContractLowHigh
Natural Gas Swap Contracts:    
2020
First quarter10,010,000  $2.69  $2.55  $2.74  
Second quarter10,010,000  2.69  2.55  2.74  
Third quarter10,120,000  2.69  2.55  2.74  
Fourth quarter10,120,000  2.69  2.55  2.74