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Subsequent events
 12 Months Ended
Dec. 31, 2018
Subsequent Events [Abstract]  
Subsequent events Subsequent events
a.    Senior Secured Credit Facility
On January 14, 2019 and February 12, 2019, the Company borrowed $30.0 million and $20.0 million, respectively, on the Senior Secured Credit Facility. As a result, the outstanding balance under the Senior Secured Credit Facility was $240.0 million as of February 13, 2019.
b.    Derivatives
The following table summarizes open derivative positions as of December 31, 2018 for derivatives that were entered into through February 13, 2019, and represents derivatives in place through December 2021 on annual production volumes:

 
 
Year 2019
 
Year 2020
 
Year 2021
Oil:
 
 
 
 
 
 
Puts:
 
 
 
 
 
 
Hedged volume (Bbl)
 
8,030,000

 
366,000

 
—

Weighted-average floor price ($/Bbl)
 
$
47.45

 
$
45.00

 
$
—

Hedged volume with deferred premium (Bbl)
 
4,745,000

 
—

 
—

Weighted-average deferred premium price ($/Bbl)
 
$
3.21

 
$
—

 
$
—

Swaps:
 
 
 
 
 
 
Hedged volume (Bbl)
 
657,000

 
695,400

 
—

Weighted-average price ($/Bbl)
 
$
53.45

 
$
52.18

 
$
—

Collars:
 
 
 
 
 
 
Hedged volume (Bbl)
 
—

 
1,134,600

 
912,500

Weighted-average floor price ($/Bbl)
 
$
—

 
$
45.00

 
$
45.00

Weighted-average ceiling price ($/Bbl)
 
$
—

 
$
76.13

 
$
71.00

Totals:
 
 
 
 
 
 
Total volume hedged with floor price (Bbl)
 
8,687,000

 
2,196,000

 
912,500

Weighted-average floor price ($/Bbl)
 
$
47.91

 
$
47.27

 
$
45.00

Total volume hedged with ceiling price (Bbl)
 
657,000

 
1,830,000

 
912,500

Weighted-average ceiling price ($/Bbl)
 
$
53.45

 
$
67.03

 
$
71.00

Basis Swaps:
 
 
 
 
 
 
WTI Midland to WTI NYMEX:
 
 
 
 
 
 
Hedged volume (Bbl)
 
1,840,000

 
—

 
—

Weighted-average price ($/Bbl)
 
$
(2.89
)
 
$
—

 
$
—

WTI Midland to WTI formula basis:
 
 
 
 
 
 
Hedged volume (Bbl)
 
552,000

 
—

 
—

Weighted-average price ($/Bbl)
 
$
(4.37
)
 
$
—

 
$
—

WTI Houston to WTI Midland:
 
 
 
 
 
 
Hedged volume (Bbl)
 
1,810,000

 
—

 
—

Weighted-average price ($/Bbl)
 
$
7.30

 
$
—

 
$
—

NGL:
 
 
 
 
 
 
Swaps - Purity Ethane:
 
 
 
 
 
 
Hedged volume (Bbl)
 
2,233,000

 
366,000

 
912,500

Weighted-average price ($/Bbl)
 
$
14.21

 
$
13.60

 
$
12.01

Swaps - Non-TET Propane:
 
 
 
 
 
 
Hedged volume (Bbl)
 
1,736,800

 
1,244,400

 
730,000

TABLE CONTINUES ON NEXT PAGE
 
 
 
 
 
 
 
 
Year 2019
 
Year 2020
 
Year 2021
Weighted-average price ($/Bbl)
 
$
27.97

 
$
26.58

 
$
25.52

Swaps - Non-TET Normal Butane:
 
 
 
 
 
 
Hedged volume (Bbl)
 
668,000

 
439,200

 
255,500

Weighted-average price ($/Bbl)
 
$
30.73

 
$
28.69

 
$
27.72

Swaps - Non-TET Isobutane:
 
 
 
 
 
 
Hedged volume (Bbl)
 
167,000

 
109,800

 
67,525

Weighted-average price ($/Bbl)
 
$
31.08

 
$
29.99

 
$
28.79

Swaps - Non-TET Natural Gasoline:
 
 
 
 
 
 
Hedged volume (Bbl)
 
583,300

 
402,600

 
237,250

Weighted-average price ($/Bbl)
 
$
45.83

 
$
45.15

 
$
44.31

Total NGL volume hedged (Bbl)
 
5,388,100

 
2,562,000

 
2,202,775

Natural gas:
 
 
 
 
 
 
Henry Hub NYMEX Swaps:
 
 
 
 
 
 
Hedged volume (MMBtu)
 
21,900,000

 
—

 
—

Weighted-average price ($/MMBtu)
 
$
3.23

 
$
—

 
$
—

Basis Swaps:
 
 
 
 
 
 
Hedged volume (MMBtu)
 
39,055,000

 
32,574,000

 
23,360,000

Weighted-average price ($/MMBtu)
 
$
(1.51
)
 
$
(0.76
)
 
$
(0.47
)

See Note 9 for discussion regarding the Company's derivative settlement indexes.