The following tables set forth unaudited financial information on a quarterly basis for each of the last two years. Fourth quarter 2018 includes goodwill impairment expense of $1.6 billion and unproved impairment expense of $441.8 million. 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 2017 Tax Act which was signed into law on December 22, 2017.

	2018
	March			June			September			December			Total
Revenues and other income:
Natural gas, NGLs and oil sales	$	696,629		$	661,390		$	736,431		$	756,627		$	2,851,077
Derivative fair value (loss) income		(14,009	)		(103,290	)		(34,591	)		100,698			(51,192	)
Brokered natural gas, marketing and other		59,979			98,084			109,385			215,312			482,760
Total revenue and other income		742,599			656,184			811,225			1,072,637			3,282,645
Costs and expenses:
Direct operating		38,122			35,088			30,926			35,395			139,531
Transportation, gathering, processing and compression		244,628			269,910			304,562			298,716			1,117,816
Production and ad valorem taxes		9,926			10,140			9,427			16,656			46,149
Brokered natural gas and marketing		55,594			102,747			116,080			221,626			496,047
Exploration		7,719			7,499			8,299			10,600			34,117
Abandonment and impairment of unproved properties		11,773			54,922			6,549			441,750			514,994
General and administrative		68,417			47,583			43,722			50,090			209,812
Termination costs		(37	)		—			(336	)		—			(373	)
Deferred compensation plan		(7,397	)		6,615			223			(18,072	)		(18,631	)
Interest		52,385			53,862			54,801			49,161			210,209
Depletion, depreciation and amortization		162,266			161,026			164,266			147,909			635,467
Impairment of proved properties and other		7,312			15,302			—			—			22,614
Impairment of goodwill		—			—			—			1,641,197			1,641,197
(Gain) loss on sale of assets		(23	)		(156	)		30			10,815			10,666
Total costs and expenses		650,685			764,538			738,549			2,905,843			5,059,615

Income (loss) before income taxes		91,914			(108,354	)		72,676			(1,833,206	)		(1,776,970	)
Income tax expense (benefit):
Current		—			—			—			—			—
Deferred		42,676			(28,518	)		24,137			(68,784	)		(30,489	)
		42,676			(28,518	)		24,137			(68,784	)		(30,489	)
Net income (loss)	$	49,238		$	(79,836	)	$	48,539		$	(1,764,422	)	$	(1,746,481	)
Net income (loss) per common share:
Basic	$	0.20		$	(0.32	)	$	0.19		$	(7.15	)	$	(7.10	)
Diluted	$	0.20		$	(0.32	)	$	0.19		$	(7.15	)	$	(7.10	)

	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 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