(17)	Selected Quarterly Financial Data (Unaudited)

The following tables set forth unaudited financial information on a quarterly basis for each of the last two years. Third quarter 2017 includes impairment expense of $63.7 million related to oil and gas properties in Oklahoma and Texas. Fourth quarter 2017 deferred income tax benefit includes the impact of the Tax Cuts and Jobs Act of 2017 which was signed into law on December 22, 2017. First quarter 2016 includes impairment expense of $43.0 million related to oil and gas properties in Western Oklahoma. Second quarter, third quarter and fourth quarter 2016 include a total of $37.2 million of expenses related to the MRD Merger (in thousands, except per share data):

	2017
	March			June			September			December			Total
Revenues and other income:
Natural gas, NGLs and oil sales	$	559,450		$	506,137		$	507,541		$	603,159		$	2,176,287
Derivative fair value income (loss)		165,557			111,195			(88,426	)		25,024			213,350
Brokered natural gas, marketing and other		51,648			55,779			63,117			50,849			221,393
Total revenue and other income		776,655			673,111			482,232			679,032			2,611,030
Costs and expenses:
Direct operating		28,023			31,420			36,888			37,921			134,252
Transportation, gathering, processing and compression		177,648			191,590			191,645			200,300			761,183
Production and ad valorem taxes		9,163			9,969			11,993			11,757			42,882
Brokered natural gas and marketing		53,550			55,857			59,773			51,131			220,311
Exploration		8,504			14,498			22,767			7,893			53,662
Abandonment and impairment of unproved properties		4,420			5,193			42,568			217,544			269,725
General and administrative		47,496			52,322			53,035			80,553			233,406
Termination costs		4,192			(96	)		(47	)		(279	)		3,770
Deferred compensation plan		(13,169	)		(14,466	)		(9,203	)		(14,077	)		(50,915	)
Interest		47,101			47,926			49,179			51,473			195,679
Depletion, depreciation and amortization		149,821			152,504			159,749			162,918			624,992
Impairment of proved properties and other		—			—			63,679			—			63,679
(Gain) loss on sale of assets		(22,600	)		(807	)		(102	)		(207	)		(23,716	)
Total costs and expenses		494,149			545,910			681,924			806,927			2,528,910

Income (loss) before income taxes		282,506			127,201			(199,692	)		(127,895	)		82,120
Income tax expense (benefit):
Current		—			—			—			17			17
Deferred		112,395			57,651			(71,992	)		(349,097	)		(251,043	)
		112,395			57,651			(71,992	)		(349,080	)		(251,026	)
Net income (loss)	$	170,111		$	69,550		$	(127,700	)	$	221,185		$	333,146
Net income (loss) per common share:
Basic	$	0.69		$	0.28		$	(0.52	)	$	0.89		$	1.34
Diluted	$	0.69		$	0.28		$	(0.52	)	$	0.89		$	1.34

	2016
	March			June			September			December			Total
Revenues and other income:
Natural gas, NGLs and oil sales	$	209,487		$	224,606		$	304,477		$	458,645		$	1,197,215
Derivative fair value income (loss)		86,908			(162,798	)		64,556			(250,057	)		(261,391	)
Brokered natural gas, marketing and other		35,018			39,989			44,174			44,934			164,115
Total revenue and other income		331,413			101,797			413,207			253,522			1,099,939
Costs and expenses:
Direct operating		24,054			20,671			22,387			30,276			97,388
Transportation, gathering, processing and compression		125,263			136,844			138,764			164,338			565,209
Production and ad valorem taxes		5,887			6,049			6,717			6,790			25,443
Brokered natural gas and marketing		36,558			40,925			44,622			46,471			168,576
Exploration		4,913			6,785			6,943			13,684			32,325
Abandonment and impairment of unproved properties		10,628			7,059			6,082			6,307			30,076
General and administrative		40,657			46,064			41,024			57,027			184,772
MRD Merger expenses		—			2,621			33,791			813			37,225
Termination costs		162			5			136			(822	)		(519	)
Deferred compensation plan		16,056			25,746			(11,636	)		(11,013	)		19,153
Interest		37,739			37,758			45,967			46,749			168,213
Depletion, depreciation and amortization		120,561			122,390			131,489			149,662			524,102
Impairment of proved properties and other		43,040			—			—			—			43,040
Loss (gain) on sale of assets		1,643			3,304			2,597			(470	)		7,074
Total costs and expenses		467,161			456,221			468,883			509,812			1,902,077

Loss before income taxes		(135,748	)		(354,424	)		(55,676	)		(256,290	)		(802,138	)
Income tax expense (benefit):
Current		—			—			—			98			98
Deferred		(41,976	)		(129,488	)		(13,705	)		(95,679	)		(280,848	)
		(41,976	)		(129,488	)		(13,705	)		(95,581	)		(280,750	)
Net loss	$	(93,772	)	$	(224,936	)	$	(41,971	)	$	(160,709	)	$	(521,388	)
Net loss per common share:
Basic	$	(0.56	)	$	(1.35	)	$	(0.23	)	$	(0.66	)	$	(2.75	)
Diluted	$	(0.56	)	$	(1.35	)	$	(0.23	)	$	(0.66	)	$	(2.75	)