Derivative Financial Instruments (Details) $ in Thousands	Jun. 30, 2018 USD ($) MMBTU bbl $ / MMBTU $ / bbl	Dec. 31, 2017 USD ($)
Summary of contracts for oil and natural gas
Derivative, Fair Value, Net \| $	$ (3,394)	$ (15,239)
Open costless collar contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) \| $	(32,496)
Open Swap Collar Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) \| $	$ 31,351
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	1,440,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	44.27
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	60.29
Fair Value of Asset (Liability) \| $	$ (15,986)
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	360,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	45.00
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	63.05
Fair Value of Asset (Liability) \| $	$ (4,381)
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	8,400,000
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) \| $	$ 79
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	960,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	50.08
Fair Value of Asset (Liability) \| $	$ (2,249)
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	2,610,000
Derivative, Swap Type, Average Fixed Price	(1.02)
Fair Value of Asset (Liability) \| $	$ 31,351
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) \| $	$ (12,208)

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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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://www.xbrl.org/2003/role/presentationRef
-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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Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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

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