Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Revenues [Abstract]
Oil and gas production revenues	$ 44,196	$ 29,092	$ 103,594	$ 71,733
Other	9	3	63	52
Total revenue	44,205	29,095	103,657	71,785
Expenses:
Lease operating expenses	7,338	5,469	19,002	18,097
Production taxes	3,825	2,637	8,867	6,475
Depreciation, depletion, and amortization	13,940	7,260	30,817	19,545
Impairment	0	158	0	2,135
General and administrative	2,452	2,410	8,392	7,737
Net interest	554	1,109	1,944	3,575
Amortization of deferred financing fees	150	344	779	1,020
Loss on derivative contracts - Realized	534	2,124	2,624	3,832
(Gain) loss on derivative contracts - Unrealized	(9,979)	4,490	(1,899)	(2,374)
Other	(8)	(96)	(6)	5
Income tax expense	0	0	0	87
Net income	25,399	3,190	33,137	11,651
Segment Assets [Abstract]
Total segment assets	317,113		317,113		223,650
U.S.
Revenues [Abstract]
Oil and gas production revenues	43,865	28,571	102,521	70,075
Other	0	0	0	0
Total revenue	43,865	28,571	102,521	70,075
Expenses:
Lease operating expenses	7,131	5,003	18,361	16,590
Production taxes	3,744	2,637	8,786	6,470
Depreciation, depletion, and amortization	13,774	6,995	30,254	18,620
Impairment		0		0
General and administrative	449	406	1,466	1,367
Net interest	141	148	419	471
Amortization of deferred financing fees	0	0	0	0
Loss on derivative contracts - Realized	0	0	0	0
(Gain) loss on derivative contracts - Unrealized	0	0	0	0
Other	0	0	0	0
Income tax expense		0		0
Net income	18,626	13,382	43,235	26,557
Segment Assets [Abstract]
Total segment assets	308,096		308,096		213,212
Canada
Revenues [Abstract]
Oil and gas production revenues	331	521	1,073	1,658
Other	0	0	0	0
Total revenue	331	521	1,073	1,658
Expenses:
Lease operating expenses	207	466	641	1,507
Production taxes	81	0	81	5
Depreciation, depletion, and amortization	104	203	376	738
Impairment		158		2,135
General and administrative	73	265	477	606
Net interest	6	6	17	17
Amortization of deferred financing fees	0	0	0	0
Loss on derivative contracts - Realized	0	0	0	0
(Gain) loss on derivative contracts - Unrealized	0	0	0	0
Other	0	0	0	0
Income tax expense		0		0
Net income	(140)	(577)	(519)	(3,350)
Segment Assets [Abstract]
Total segment assets	911		911		1,640
Corporate
Revenues [Abstract]
Oil and gas production revenues	0	0	0	0
Other	9	3	63	52
Total revenue	9	3	63	52
Expenses:
Lease operating expenses	0	0	0	0
Production taxes	0	0	0	0
Depreciation, depletion, and amortization	62	62	187	187
Impairment		0		0
General and administrative	1,930	1,739	6,449	5,764
Net interest	407	955	1,508	3,087
Amortization of deferred financing fees	150	344	779	1,020
Loss on derivative contracts - Realized	534	2,124	2,624	3,832
(Gain) loss on derivative contracts - Unrealized	(9,979)	4,490	(1,899)	(2,374)
Other	(8)	(96)	(6)	5
Income tax expense		0		87
Net income	6,913	(9,615)	(9,579)	(11,556)
Segment Assets [Abstract]
Total segment assets	$ 8,106		$ 8,106		$ 8,798