The operating results and assets of the Company’s reportable segments were as follows for the three months ended September 30, 2017 and 2018 (in thousands):


	Exploration and production		Gathering and processing	Water handling and treatment	Marketing	Elimination of intersegment transactions	Consolidated total
Three months ended September 30, 2017:
Sales and revenues:
Third-party	$	594,244	2,609	260	50,767	—	647,880
Intersegment		3,070	97,909	92,851	—	(193,830)	—
Total	$	597,314	100,518	93,111	50,767	(193,830)	647,880

Operating expenses:
Lease operating	$	24,060	—	51,569	—	(52,138)	23,491
Gathering, compression, processing, and transportation		369,538	10,468	—	—	(97,872)	282,134
Impairment of unproved properties		41,000	—	—	—	—	41,000
Depletion, depreciation, and amortization		176,188	22,027	8,753	—	—	206,968
General and administrative		48,289	9,336	4,980	—	(402)	62,203
Other		24,259	92	3,457	78,884	(2,556)	104,136
Total		683,334	41,923	68,759	78,884	(152,968)	719,932
Operating income (loss)	$	(86,020)	58,595	24,352	(28,117)	(40,862)	(72,052)
Equity in earnings of unconsolidated affiliates	$	—	7,033	—	—	—	7,033
Segment assets	$	12,751,606	2,158,107	752,982	15,807	(829,288)	14,849,214
Capital expenditures for segment assets	$	413,742	99,254	48,019	—	(39,358)	521,657


	Exploration and production		Gathering and processing	Water handling and treatment	Marketing	Elimination of intersegment transactions	Consolidated total
Three months ended September 30, 2018:
Sales and revenues:
Third-party	$	982,131	4,441	404	89,556	—	1,076,532
Intersegment		5,197	128,761	132,599	—	(266,557)	—
Total	$	987,328	133,202	133,003	89,556	(266,557)	1,076,532

Operating expenses:
Lease operating	$	35,124	—	67,608	—	(66,463)	36,269
Gathering, compression, processing, and transportation		442,602	12,131	570	—	(128,799)	326,504
Impairment of unproved properties		221,094	—	—	—	—	221,094
Impairment of gathering systems and facilities		—	1,157	—	—	—	1,157
Depletion, depreciation, and amortization		204,465	26,095	12,626	—	—	243,186
General and administrative		45,474	11,783	3,235	—	(632)	59,860
Other		30,695	186	5,033	151,764	(4,020)	183,658
Total		979,454	51,352	89,072	151,764	(199,914)	1,071,728
Operating income (loss)	$	7,874	81,850	43,931	(62,208)	(66,643)	4,804
Equity in earnings of unconsolidated affiliates	$	—	10,705	—	—	—	10,705
Segment assets	$	13,484,457	2,367,855	1,043,641	20,481	(1,113,899)	15,802,535
Capital expenditures for segment assets	$	485,219	130,695	19,258	—	(67,951)	567,221

The operating results and assets of the Company’s reportable segments were as follows for the nine months ended September 30, 2017 and 2018 (in thousands):


	Exploration and production		Gathering and processing	Water handling and treatment	Marketing	Elimination of intersegment transactions	Consolidated total
Nine months ended September 30, 2017:
Sales and revenues:
Third-party	$	2,458,524	7,472	1,193	166,659	—	2,633,848
Intersegment		11,421	283,467	270,033	—	(564,921)	—
Total	$	2,469,945	290,939	271,226	166,659	(564,921)	2,633,848

Operating expenses:
Lease operating	$	56,991	—	131,635	—	(132,592)	56,034
Gathering, compression, processing, and transportation		1,070,522	28,492	—	—	(283,304)	815,710
Impairment of unproved properties		83,098	—	—	—	—	83,098
Depletion, depreciation, and amortization		521,603	64,445	24,831	—	—	610,879
General and administrative		148,876	30,179	13,383	—	(1,438)	191,000
Other		75,030	104	12,333	246,298	(9,672)	324,093
Total		1,956,120	123,220	182,182	246,298	(427,006)	2,080,814
Operating income (loss)	$	513,825	167,719	89,044	(79,639)	(137,915)	553,034
Equity in earnings of unconsolidated affiliates	$	—	12,887	—	—	—	12,887
Segment assets	$	12,751,606	2,158,107	752,982	15,807	(829,288)	14,849,214
Capital expenditures for segment assets	$	1,455,168	254,619	143,470	—	(135,718)	1,717,539


	Exploration and production		Gathering and processing	Water handling and treatment	Marketing	Elimination of intersegment transactions	Consolidated total
Nine months ended September 30, 2018:
Sales and revenues:
Third-party	$	2,590,409	12,849	2,450	488,270	—	3,093,978
Intersegment		16,251	347,249	384,224	—	(747,724)	—
Total	$	2,606,660	360,098	386,674	488,270	(747,724)	3,093,978

Operating expenses:
Lease operating	$	98,698	—	184,698	—	(190,241)	93,155
Gathering, compression, processing, and transportation		1,236,655	35,899	570	—	(346,896)	926,228
Impairment of unproved properties		406,068	—	—	—	—	406,068
Impairment of gathering systems and facilities		—	9,658	—	—	—	9,658
Depletion, depreciation, and amortization		601,446	74,215	33,819	—	—	709,480
General and administrative		138,555	34,140	10,827	—	(1,946)	181,576
Other		85,067	204	14,925	560,924	(11,841)	649,279
Total		2,566,489	154,116	244,839	560,924	(550,924)	2,975,444
Operating income (loss)	$	40,171	205,982	141,835	(72,654)	(196,800)	118,534
Equity in earnings of unconsolidated affiliates	$	—	27,832	—	—	—	27,832
Segment assets	$	13,484,457	2,367,855	1,043,641	20,481	(1,113,899)	15,802,535
Capital expenditures for segment assets	$	1,464,041	337,448	77,385	—	(202,629)	1,676,245