Acquisitions and Disposition (Tables)

12 Months Ended

Dec. 31, 2015

Unaudited Summary Pro Forma Financial Information

	For the Years Ended December 31,
	2014		2013
Revenues	$	180,458	$	151,766
Income from operations		53,526		36,002
Income available to common stockholders		33,674		4,033
Net income per common share
Basic	$	0.57	$	0.07
Diluted	$	0.56	$	0.07

Central Midland Basin Texas [Member] | 2015 acquisitions [Member]

Fair Value of Net Assets Acquired

Oil and natural gas properties	$	24,926
Unevaluated oil and natural gas properties		4,911
Asset retirement obligations		(37)
Net assets acquired	$	29,800

Central Midland Basin Texas [Member] | 2014 acquisitions [Member]

Fair Value of Net Assets Acquired

Oil and natural gas properties	$	91,895
Unevaluated oil and natural gas properties		118,450
Asset retirement obligations		(140)
Net assets acquired	$	210,205

Southern Midland Basin Texas [Member] | 2014 acquisitions [Member]

Fair Value of Net Assets Acquired

Oil and natural gas properties	$	930
Unevaluated oil and natural gas properties		7,394
Asset retirement obligations		(124)
Net assets acquired	$	8,200

Southern Midland Basin Texas [Member] | 2013 acquisitions [Member]

Fair Value of Net Assets Acquired

Oil and natural gas properties	$	9,025
Unevaluated oil and natural gas properties		2,000
Asset retirement obligations		(25)
Net assets acquired	$	11,000