Quarterly Financial Data (Tables)

12 Months Ended

Sep. 30, 2020

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Financial Information

Quarter Ended	Operating Revenues		Operating Income (Loss)		Net Income (Loss) Available for Common Stock			Earnings (Loss) per Common Share
								Basic		Diluted
	(Thousands, except per common share amounts)
2020
9/30/2020	$	287,989	$	(173,979)	$	(145,545)	(1)	$	(1.60)	$	(1.60)
6/30/2020	$	323,019	$	80,397	$	41,250	(2)	$	0.47	$	0.47
3/31/2020	$	491,095	$	(24,580)	$	(106,068)	(3)	$	(1.23)	$	(1.23)
12/31/2019	$	444,188	$	148,020	$	86,591		$	1.00	$	1.00
2019
9/30/2019	$	293,341	$	83,940	$	47,282		$	0.55	$	0.54
6/30/2019	$	357,200	$	112,827	$	63,753		$	0.74	$	0.73
3/31/2019	$	552,544	$	153,359	$	90,595		$	1.05	$	1.04
12/31/2018	$	490,247	$	161,683	$	102,660	(4)	$	1.19	$	1.18

(1)Includes a non-cash $253.4 million impairment charge ($183.7 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.

(2)Includes a non-cash $18.2 million impairment charge ($13.3 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.

(3)Includes a non-cash $177.8 million impairment charge ($129.3 million after tax) associated with the Exploration and Production segment's oil and gas producing properties and a $56.8 million valuation allowance recorded against certain deferred tax assets.

(4)Includes a $5.0 million reduction to income tax expense associated with the remeasurement of accumulated deferred income taxes in accordance with the 2017 Tax Reform Act.