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Price-Risk Management Price-Risk Management (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
bbl
MMBTU
$ / MMBTU
$ / Boe
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
bbl
MMBTU
$ / MMBTU
$ / Boe
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Gain (Loss) on Price Risk Derivatives, Net | $ $ 13,400 $ (13,600) $ 34,300 $ (30,700)  
Cash Received (Paid) On Settlements of Derivative Contracts | $     16,087 $ (5,671)  
Receivables for Settled Derivatives | $ 3,200   3,200   $ 700
Payables for Settled Derivatives | $ 100   100   2,200
Derivative, Fair Value, Net | $ 26,600   26,600   13,000
Other Current Assets [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset | $ 20,600   20,600   15,300
Other Noncurrent Assets [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset | $ 7,100   7,100   4,300
Other Current Liabilities [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Liability, Fair Value, Gross Liability | $ 900   900   2,800
Other Noncurrent Liabilities [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Liability, Fair Value, Gross Liability | $ $ 100   $ 100   $ 3,700
Swap [Member] | Oil Derivative Swaps [Member] | Fourth Quarter 2019 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 280,567   280,567    
Derivative, Swap Type, Fixed Price | $ / Boe 59.57   59.57    
Swap [Member] | Oil Derivative Swaps [Member] | First Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 272,767   272,767    
Derivative, Swap Type, Fixed Price | $ / Boe 56.97   56.97    
Swap [Member] | Oil Derivative Swaps [Member] | Second Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 289,119   289,119    
Derivative, Swap Type, Fixed Price | $ / Boe 56.88   56.88    
Swap [Member] | Oil Derivative Swaps [Member] | Third Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 306,904   306,904    
Derivative, Swap Type, Fixed Price | $ / Boe 56.70   56.70    
Swap [Member] | Oil Derivative Swaps [Member] | Fourth Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 299,121   299,121    
Derivative, Swap Type, Fixed Price | $ / Boe 54.74   54.74    
Swap [Member] | Oil Derivative Swaps [Member] | First Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 56,175   56,175    
Derivative, Swap Type, Fixed Price | $ / Boe 55.23   55.23    
Swap [Member] | Oil Derivative Swaps [Member] | Second Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 52,325   52,325    
Derivative, Swap Type, Fixed Price | $ / Boe 57.00   57.00    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2019 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 11,486,000   11,486,000    
Derivative, Swap Type, Fixed Price 2.89   2.89    
Swap [Member] | Natural Gas Derivative Swaps [Member] | First Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 9,920,000   9,920,000    
Derivative, Swap Type, Fixed Price 2.73   2.73    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Second Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 7,328,000   7,328,000    
Derivative, Swap Type, Fixed Price 2.63   2.63    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Third Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 7,265,000   7,265,000    
Derivative, Swap Type, Fixed Price 2.63   2.63    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 7,042,000   7,042,000    
Derivative, Swap Type, Fixed Price 2.63   2.63    
Swap [Member] | Natural Gas Liquid Derivative [Member] | Fourth Quarter 2019 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 180,000   180,000    
Derivative, Swap Type, Fixed Price 27.93   27.93    
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | First Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 4,354,800   4,354,800    
Derivative, Average Floor Price 2.50   2.50    
Derivative, Average Cap Price 3.52   3.52    
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Second Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 3,791,000   3,791,000    
Derivative, Average Floor Price 2.20   2.20    
Derivative, Average Cap Price 2.75   2.75    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Fourth Quarter 2019 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 14,625,000   14,625,000    
Derivative, Swap Type, Fixed Price (0.02)   (0.02)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | First Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 11,739,000   11,739,000    
Derivative, Swap Type, Fixed Price (0.03)   (0.03)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Second Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 11,739,000   11,739,000    
Derivative, Swap Type, Fixed Price (0.04)   (0.04)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Third Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 11,868,000   11,868,000    
Derivative, Swap Type, Fixed Price (0.03)   (0.03)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Fourth Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 11,868,000   11,868,000    
Derivative, Swap Type, Fixed Price (0.04)   (0.04)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | First Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 7,200,000   7,200,000    
Derivative, Swap Type, Fixed Price (0.003)   (0.003)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Second Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 7,280,000   7,280,000    
Derivative, Swap Type, Fixed Price (0.003)   (0.003)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Third Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 7,360,000   7,360,000    
Derivative, Swap Type, Fixed Price (0.003)   (0.003)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 7,360,000   7,360,000    
Derivative, Swap Type, Fixed Price (0.003)   (0.003)    
Basis Swap [Member] | Oil Basis Derivative [Member] | Fourth Quarter 2019 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 75,000   75,000    
Derivative, Swap Type, Fixed Price 3.73   3.73    
Basis Swap [Member] | Oil Basis Derivative [Member] | First Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 136,500   136,500    
Derivative, Swap Type, Fixed Price 0.51   0.51    
Basis Swap [Member] | Oil Basis Derivative [Member] | Second Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 136,500   136,500    
Derivative, Swap Type, Fixed Price 0.51   0.51    
Basis Swap [Member] | Oil Basis Derivative [Member] | Third Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 138,000   138,000    
Derivative, Swap Type, Fixed Price 0.51   0.51    
Basis Swap [Member] | Oil Basis Derivative [Member] | Fourth Quarter 2020 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 138,000   138,000    
Derivative, Swap Type, Fixed Price 0.51   0.51