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Price-Risk Management Price-Risk Management (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
MMBTU
$ / MMBTU
$ / Boe
bbl
Dec. 31, 2018
USD ($)
Sep. 30, 2019
bbl
MMBTU
$ / MMBTU
Derivative [Line Items]      
Gain (Loss) on Price Risk Derivatives, Net | $ $ 24,200 $ (9,800)  
Cash Received (Paid) On Settlements of Derivative Contracts | $ 24,631 (19,677)  
Receivables for Settled Derivatives | $ 2,900 700  
Payables for Settled Derivatives | $ 200 2,200  
Derivative, Fair Value, Net | $ 8,400 13,000  
Other Current Assets [Member]      
Derivative [Line Items]      
Derivative Asset, Fair Value, Gross Asset | $ 12,800 15,300  
Other Noncurrent Assets [Member]      
Derivative [Line Items]      
Derivative Asset, Fair Value, Gross Asset | $ 3,900 4,300  
Other Current Liabilities [Member]      
Derivative [Line Items]      
Derivative Liability, Fair Value, Gross Liability | $ 6,600 2,800  
Other Noncurrent Liabilities [Member]      
Derivative [Line Items]      
Derivative Liability, Fair Value, Gross Liability | $ $ 1,600 $ 3,700  
Swap [Member] | First Quarter 2020 [Member] | Oil Derivative [Member]      
Derivative [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 361,597    
Derivative, Swap Type, Average Fixed Price | $ / Boe 56.61    
Swap [Member] | First Quarter 2020 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 9,920,000    
Derivative, Swap Type, Average Fixed Price 2.73    
Swap [Member] | Second Quarter 2020 [Member] | Oil Derivative [Member]      
Derivative [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 452,569    
Derivative, Swap Type, Average Fixed Price | $ / Boe 56.41    
Swap [Member] | Second Quarter 2020 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 7,328,000    
Derivative, Swap Type, Average Fixed Price 2.63    
Swap [Member] | Third Quarter 2020 [Member] | Oil Derivative [Member]      
Derivative [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 500,279    
Derivative, Swap Type, Average Fixed Price | $ / Boe 55.92    
Swap [Member] | Third Quarter 2020 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 7,265,000    
Derivative, Swap Type, Average Fixed Price 2.63    
Swap [Member] | Fourth Quarter 2020 [Member] | Oil Derivative [Member]      
Derivative [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 421,621    
Derivative, Swap Type, Average Fixed Price | $ / Boe 54.61    
Swap [Member] | Fourth Quarter 2020 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 7,042,000    
Derivative, Swap Type, Average Fixed Price 2.63    
Swap [Member] | First Quarter 2021 [Member] | Oil Derivative [Member]      
Derivative [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 328,603    
Derivative, Swap Type, Average Fixed Price | $ / Boe 53.11    
Swap [Member] | First Quarter 2021 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 148,078    
Derivative, Swap Type, Average Fixed Price 2.70    
Swap [Member] | Second Quarter 2021 [Member] | Oil Derivative [Member]      
Derivative [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 320,033    
Derivative, Swap Type, Average Fixed Price | $ / Boe 53.46    
Swap [Member] | Second Quarter 2021 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 442,255    
Derivative, Swap Type, Average Fixed Price 2.30    
Swap [Member] | Third Quarter 2021 [Member] | Oil Derivative [Member]      
Derivative [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 313,848    
Derivative, Swap Type, Average Fixed Price | $ / Boe 52.38    
Swap [Member] | Fourth Quarter 2021 [Member] | Oil Derivative [Member]      
Derivative [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 230,000    
Derivative, Swap Type, Average Fixed Price | $ / Boe 53.22    
Collar Contracts [Member] | First Quarter 2021 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Derivative, Average Floor Price 2.50    
Derivative, Average Cap Price 3.52    
Derivative, Nonmonetary Notional Amount | MMBTU     4,354,800
Collar Contracts [Member] | Second Quarter 2021 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Derivative, Average Floor Price 2.20    
Derivative, Average Cap Price 2.75    
Derivative, Nonmonetary Notional Amount | MMBTU     3,791,000
Collar Contracts [Member] | Third Quarter 2021 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Derivative, Average Floor Price 2.00    
Derivative, Average Cap Price 2.70    
Derivative, Nonmonetary Notional Amount | MMBTU     4,007,175
Collar Contracts [Member] | Fourth Quarter 2021 [Member] | Natural Gas Derivative [Member]      
Derivative [Line Items]      
Derivative, Average Floor Price 2.25    
Derivative, Average Cap Price 2.75    
Derivative, Nonmonetary Notional Amount | MMBTU     3,726,000
Basis Swap [Member] | First Quarter 2020 [Member] | Natural Gas Basis Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 11,739,000    
Derivative, Swap Type, Average Fixed Price     (0.03)
Basis Swap [Member] | First Quarter 2020 [Member] | Oil Basis Derivative [Member]      
Derivative [Line Items]      
Derivative, Swap Type, Average Fixed Price     0.49
Derivative, Nonmonetary Notional Amount | bbl     182,000
Basis Swap [Member] | Second Quarter 2020 [Member] | Natural Gas Basis Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 11,739,000    
Derivative, Swap Type, Average Fixed Price     (0.04)
Basis Swap [Member] | Second Quarter 2020 [Member] | Oil Basis Derivative [Member]      
Derivative [Line Items]      
Derivative, Swap Type, Average Fixed Price     0.49
Derivative, Nonmonetary Notional Amount | bbl     182,000
Basis Swap [Member] | Third Quarter 2020 [Member] | Natural Gas Basis Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 11,868,000    
Derivative, Swap Type, Average Fixed Price     (0.03)
Basis Swap [Member] | Third Quarter 2020 [Member] | Oil Basis Derivative [Member]      
Derivative [Line Items]      
Derivative, Swap Type, Average Fixed Price     0.49
Derivative, Nonmonetary Notional Amount | bbl     184,000
Basis Swap [Member] | Fourth Quarter 2020 [Member] | Natural Gas Basis Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 11,868,000    
Derivative, Swap Type, Average Fixed Price     (0.04)
Basis Swap [Member] | Fourth Quarter 2020 [Member] | Oil Basis Derivative [Member]      
Derivative [Line Items]      
Derivative, Swap Type, Average Fixed Price     0.49
Derivative, Nonmonetary Notional Amount | bbl     184,000
Basis Swap [Member] | First Quarter 2021 [Member] | Natural Gas Basis Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 7,200,000    
Derivative, Swap Type, Average Fixed Price     (0.003)
Basis Swap [Member] | Second Quarter 2021 [Member] | Natural Gas Basis Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 7,280,000    
Derivative, Swap Type, Average Fixed Price     (0.003)
Basis Swap [Member] | Third Quarter 2021 [Member] | Natural Gas Basis Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 7,360,000    
Derivative, Swap Type, Average Fixed Price     (0.003)
Basis Swap [Member] | Fourth Quarter 2021 [Member] | Natural Gas Basis Derivative [Member]      
Derivative [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 7,360,000    
Derivative, Swap Type, Average Fixed Price     (0.003)