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Derivative Financial Instruments (Details) $ in Thousands | Feb. 22, 2017 bbl $ / bbl | Dec. 31, 2016 USD ($) bbl MMBTU $ / MMBTU $ / bbl
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Open costless collar contracts [Member] |  |
Summary of contracts for oil and natural gas |  |
Fair Value of Asset (Liability) | $ |  | $ (24,954)
Open costless collar contracts [Member] | Oil, Calculation Period One [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | bbl |  | 2,760,000
Summary of contracts for oil and natural gas |  |
Price Floor |  | 41.39
Price Ceiling |  | 51.88
Fair Value of Asset (Liability) | $ |  | $ (18,316)
Open costless collar contracts [Member] | Oil, Calculation Period Two [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | bbl |  | 720,000
Summary of contracts for oil and natural gas |  |
Price Floor |  | 43.75
Price Ceiling |  | 63.90
Fair Value of Asset (Liability) | $ |  | $ (751)
Open costless collar contracts [Member] | Natural Gas, Calculation Period One [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | MMBTU |  | 16,860,000
Summary of contracts for oil and natural gas |  |
Price Floor | $ / MMBTU |  | 2.40
Price Ceiling | $ / MMBTU |  | 3.59
Fair Value of Asset (Liability) | $ |  | $ (5,887)
Subsequent Event [Member] | Oil [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | bbl | 1,890,000 |
Summary of contracts for oil and natural gas |  |
Price Floor | 50.00 |
Price Ceiling | 60.75 |

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- Definition Open costless collar contracts for oil and natural gas. + References No definition available. + Details
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- Definition 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 + Details
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