Derivative Financial Instruments (Details) - Open costless collar contracts $ in Thousands	Jun. 30, 2017 USD ($) MMBTU bbl $ / bbl $ / MMBTU
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ 8,867
Oil, Calculation Period 04/01/2017 - 12/31/2017
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) | bbl	2,460,000
Weighted Average Price Floor ($/Bbl or $/MMBtu) | $ / bbl	45.17
Weighted Average Price Ceiling ($/Bbl or $/MMBtu) | $ / bbl	55.75
Fair Value of Asset (Liability)	$ 4,365
Oil, Calculation Period 01/01/2018 - 12/31/2018
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) | bbl	1,920,000
Weighted Average Price Floor ($/Bbl or $/MMBtu) | $ / bbl	43.91
Weighted Average Price Ceiling ($/Bbl or $/MMBtu) | $ / bbl	63.44
Fair Value of Asset (Liability)	$ 4,990
Natural Gas, Calculation Period 04/01/2017 - 12/31/2017
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) | MMBTU	12,540,000
Weighted Average Price Floor ($/Bbl or $/MMBtu) | $ / MMBTU	2.51
Weighted Average Price Ceiling ($/Bbl or $/MMBtu) | $ / MMBTU	3.60
Fair Value of Asset (Liability)	$ (500)
Natural Gas, Calculation Period 01/01/2018 - 12/31/2018
Summary of contracts for oil and natural gas
Notional Quantity (Bbl or MMBtu) | MMBTU	16,800,000
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)	$ 12