Derivative Financial Instruments (Details) $ in Thousands	Sep. 30, 2019 USD ($) bbl MMBTU $ / bbl $ / MMBTU	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Derivative Asset (Liability), Net | $	$ 20,131	$ 49,846
Open costless collar contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) | $	18,990
Open Swap Collar Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) | $	$ (1,252)
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	1,950,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	50.26
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	70.94
Fair Value of Asset (Liability) | $	$ 3,242
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	600,000
Weighted Average Price Floor ($/Bbl or $/MMBtu) | $ / MMBTU	2.50
Weighted Average Price Ceiling ($/Bbl or $/MMBtu) | $ / MMBTU	3.80
Fair Value of Asset (Liability) | $	$ 91
Derivative Contract, Calculation Period One | Open Three-way Costless Collar Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) | $	$ 2,393
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	330,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	60.00
Fair Value of Asset (Liability) | $	$ 2,216
Derivative Contract, Calculation Period One | Open Three-way Costless Collar Contracts | Natural Gas
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) | bbl	1,200,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	2.50
Fair Value of Asset (Liability) | $	$ 177
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	1,308,000
Derivative, Swap Type, Average Fixed Price	0.47
Fair Value of Asset (Liability) | $	$ (248)
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 $/MMBtu)	75.00
Derivative Contract, Calculation Period One | Short Call | Open Three-way Costless Collar Contracts | Natural Gas
Summary of contracts for oil and natural gas
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	3.00
Derivative Contract, Calculation Period One | Long Call | Open Three-way Costless Collar Contracts | Oil - WTI
Summary of contracts for oil and natural gas
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	78.85
Derivative Contract, Calculation Period One | Long Call | Open Three-way Costless Collar Contracts | Natural Gas
Summary of contracts for oil and natural gas
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	3.24
Derivative Contract, Calculation Period Two | Open costless collar contracts | Oil - WTI
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) | bbl	4,860,000
Weighted Average Price Floor ($/Bbl or $/MMBtu)	48.50
Weighted Average Price Ceiling ($/Bbl or $/MMBtu)	67.44
Fair Value of Asset (Liability) | $	$ 15,657
Derivative Contract, Calculation Period Two | Open Swap Collar Contracts | Oil Basis Swaps
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) | bbl	4,494,000
Derivative, Swap Type, Average Fixed Price	0.42
Fair Value of Asset (Liability) | $	$ (864)
Derivative Contract, Calculation Period Three | Open Swap Collar Contracts | Oil Basis Swaps
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) | bbl	2,880,000
Derivative, Swap Type, Average Fixed Price	0.65
Fair Value of Asset (Liability) | $	$ (140)