Quarterly Financial Data (Tables)

12 Months Ended

Sep. 30, 2017

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)
2017
9/30/2017	$	286,937	$	87,395		$	45,577			$	0.53		$	0.53
6/30/2017	$	348,369	$	123,354		$	59,714			$	0.70		$	0.69
3/31/2017	$	522,075	$	169,957		$	89,283			$	1.05		$	1.04
12/31/2016	$	422,500	$	172,139		$	88,908			$	1.04		$	1.04
2016
9/30/2016	$	292,472	$	81,244		$	37,553		(1)	$	0.44		$	0.44
6/30/2016	$	335,617	$	45,162		$	8,286		(2)	$	0.10		$	0.10
3/31/2016	$	449,132	$	(237,000	)	$	(147,688	)	(3)	$	(1.74	)	$	(1.74	)
12/31/2015	$	375,195	$	(305,924	)	$	(189,109	)	(4)	$	(2.23	)	$	(2.23	)

(1) Includes a non-cash $32.7 million impairment charge ($19.0 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.

(2) Includes a non-cash $82.7 million impairment charge ($47.9 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.

(3) Includes a non-cash $397.4 million impairment charge ($230.5 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.

(4) Includes a non-cash $435.5 million impairment charge ($252.6 million after tax) associated with the Exploration and Production segment's oil and gas producing properties.