Reporting Segments (Tables)

12 Months Ended

Dec. 31, 2015

The following tables set forth our segment information for the periods indicated (in thousands):


	Year Ended December 31, 2015
	Exploration & Production		Midstream		Total
Operating revenues
Natural gas sales	$	19,809	$	—	$	19,809
Oil sales		35,297		—		35,297
Natural gas liquids sales		1,597		—		1,597
Gathering and transportation sales		—		11,725		11,725
Total operating revenues		56,703		11,725		68,428

Operating expenses:
Lease operating expenses		19,890		98		19,988
Transportation operating expenses		—		2,176		2,176
Cost of sales		595		—		595
Production taxes		1,792		—		1,792
General and administrative		26,109		—		26,109
Exploration costs		1,866		—		1,866
Gain on sale of assets		(111)		—		(111)
Depreciation, depletion and amortization		10,330		4,206		14,536
Asset impairments		123,860		—		123,860
Accretion expense		1,048		51		1,099
Total operating expenses		185,379		6,531		191,910

Operating income (loss)	$	(128,676)	$	5,194	$	(123,482)


	Year Ended December 31, 2014
	Exploration & Production		Midstream		Total
Operating revenues
Natural gas sales	$	34,458	$	—	$	34,458
Oil sales		40,337		—		40,337
Natural gas liquids sales		2,477		—		2,477
Gathering and transportation sales		—		—		—
Total operating revenues		77,272		—		77,272

Operating expenses:
Lease operating expenses		21,012		—		21,012
Cost of sales		1,487		—		1,487
Production taxes		3,200		—		3,200
General and administrative		16,499		—		16,499
Loss on sale of assets		223		—		223
Depreciation, depletion and amortization		17,533		—		17,533
Asset impairments		5,424		—		5,424
Accretion expense		604		—		604
Total operating expenses		65,982		—		65,982

Operating income	$	11,290	$	—	$	11,290

The following table summarizes the total assets by operating segment for the years ended December 31, 2015 and 2014 (in thousands):