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Price-Risk Management Price-Risk Management (Tables)
 6 Months Ended
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments [Table Text Block]
The following tables summarize the weighted average prices as well as future production volumes for our unsettled derivative contracts in place as of June 30, 2018:

Oil Derivative Swaps
(NYMEX WTI Settlements)
Total Volumes
(Bbls)
 
Weighted Average Price
2018 Contracts
 
 
 
3Q18
130,400

 
$
52.40

4Q18
122,800

 
$
52.23

 
 
 
 
2019 Contracts
 
 
 
1Q19
107,700

 
$
52.77

2Q19
103,200

 
$
52.72

3Q19
99,000

 
$
52.79

4Q19
95,000

 
$
52.73

 
 
 
 
2020 Contracts
 
 
 
1Q20
81,300

 
$
52.42

2Q20
77,850

 
$
52.38

3Q20
74,700

 
$
52.34

4Q20
72,000

 
$
52.29


Natural Gas Derivative Contracts
(NYMEX Henry Hub Settlements)
Total Volumes
(MMBtu)
 
Weighted Average Price
2018 Contracts
 
 
 
3Q18
7,666,000

 
$
2.88

4Q18
12,121,000

 
$
2.96

 
 
 
 
2019 Contracts
 
 
 
1Q19
7,516,000

 
$
3.08

2Q19
6,060,000

 
$
2.83

3Q19
5,550,000

 
$
2.84

4Q19
5,966,000

 
$
2.84

 
 
 
 
2020 Contracts
 
 
 
1Q20
5,370,000

 
$
2.83

2Q20
3,688,000

 
$
2.76

3Q20
3,585,000

 
$
2.76

4Q20
3,362,000

 
$
2.77


NGL Contracts
Total Volumes (Bbls)
 
Weighted Average Price
2018 Contracts
 
 
 
3Q18
112,200

 
$
24.78

4Q18
148,200

 
$
24.78



Natural Gas Basis Derivative Swap
(East Texas Houston Ship Channel vs NYMEX Settlements)
Total Volumes
(MMBtu)
 
Weighted Average Price
2018 Contracts
 
 
 
3Q18
7,595,000

 
$
(0.01
)
4Q18
11,850,000

 
$
(0.07
)
 
 
 
 
2019 Contracts
 
 
 
1Q19
11,310,000

 
$
(0.08
)
2Q19
11,975,000

 
$
0.04

3Q19
12,095,000

 
$
0.03

4Q19
12,095,000

 
$
(0.04
)
 
 
 
 
2020 Contracts
 
 
 
1Q20
1,820,000

 
$
(0.10
)
2Q20
1,820,000

 
$
(0.09
)
3Q20
1,840,000

 
$
(0.07
)
4Q20
1,840,000

 
$
(0.11
)

Oil Basis Contracts
Total Volumes (Bbls)
 
Weighted Average Price
2018 Contracts
 
 
 
3Q18
80,000

 
$
4.13

4Q18
120,000

 
$
4.13