Derivative Financial Instruments (Details) $ in Thousands	Sep. 30, 2018 USD ($) MMBTU bbl $ / MMBTU $ / bbl
Open costless collar contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) \| $	$ (33,518)
Open Swap Collar Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) \| $	$ 10,155
Derivative Contract, Calculation Period One \| Open costless collar contracts \| Oil - WTI
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	720,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	44.27
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	60.29
Fair Value of Asset (Liability) \| $	$ (9,240)
Derivative Contract, Calculation Period One \| Open costless collar contracts \| Oil - LLS
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	180,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	45.00
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	63.05
Fair Value of Asset (Liability) \| $	$ (2,973)
Derivative Contract, Calculation Period One \| Open costless collar contracts \| Natural Gas
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| MMBTU	4,200,000
Weighted Average Price Floor ($/Bbl or $/MMBtu) \| $ / MMBTU	2.58
Weighted Average Price Ceiling ($/Bbl or $/MMBtu) \| $ / MMBTU	3.67
Fair Value of Asset (Liability) \| $	$ (18)
Derivative Contract, Calculation Period One \| Open Three-way Costless Collar Contracts \| Oil - WTI
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	480,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	50.08
Fair Value of Asset (Liability) \| $	$ (1,369)
Derivative Contract, Calculation Period One \| Open Swap Collar Contracts \| Oil Basis Swaps
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	1,305,000
Derivative, Swap Type, Average Fixed Price	(1.02)
Fair Value of Asset (Liability) \| $	$ 10,155
Derivative Contract, Calculation Period One \| Short Call \| Open Three-way Costless Collar Contracts \| Oil - WTI
Summary of contracts for oil and natural gas
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	63.50
Derivative Contract, Calculation Period One \| Long Call \| Open Three-way Costless Collar Contracts \| Oil - WTI
Summary of contracts for oil and natural gas
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	66.68
Derivative Contract, Calculation Period Two \| Open costless collar contracts \| Oil - WTI
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) \| bbl	2,400,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	50.00
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	64.75
Fair Value of Asset (Liability) \| $	$ (21,287)

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Open costless collar contracts for oil and natural gas.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Average fixed price related to the group of price risk swap derivatives.

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