	First		Second		Third		Fourth
(in thousands, except per unit data)	quarter		quarter		quarter		quarter
Year ended December 31, 2017:
Total operating revenues	$	174,770		193,766		193,629		210,332
Total operating expenses(1)		93,073		101,199		110,458		143,089
Operating income		81,697		92,567		83,171		67,243
Net income		75,092		87,175		80,893		64,155
Less: general partner's interest in net income		(11,553)		(15,328)		(19,067)		(23,772)
Net income attributable to limited partner units	$	63,539		71,847		61,826		40,383

Net income per limited partner unit–basic and diluted	$	0.35		0.39		0.33		0.22

Year ended December 31, 2018:
Total operating revenues	$	229,591		250,975		266,205		281,751
Total operating expenses(2)		118,051		136,145		140,159		26,597
Operating income		111,540		114,830		126,046		255,154
Net income		108,105		109,466		119,764		248,609
Less: general partner's interest in net income		(28,453)		(33,145)		(37,816)		(43,492)
Net income attributable to limited partner units	$	79,652		76,321		81,948		205,117

Net income per limited partner unit–basic	$	0.43		0.41		0.44		1.10

Net income per limited partner unit–diluted	$	0.43		0.41		0.44		1.09

(1)Operating expenses in the fourth quarter of 2017 include $23 million of impairment on certain condensate gathering lines that Antero Resources no longer uses.

(2)Operating expenses in the fourth quarter of 2018 reflects a $106 million reduction in the fair value of contingent acquisition consideration.