Summarized Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data [Line Items]

Schedule of quarterly operating results

The Company's business is seasonal in character. The following data summarizes quarterly operating results.

	Year ended December 31, 2012
(in thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenues	$	418,444	$	470,355	$	295,324	$	433,046
Operating income	$	104,170	$	220,598	$	19,458	$	115,166
Net income	$	57,406	$	131,287	$	2,046	$	62,823
Diluted earnings per average common share	$	0.79	$	1.82	$	0.03	$	0.87
Basic earnings per average common share	$	0.80	$	1.82	$	0.03	$	0.87

	Year ended December 31, 2011
(in thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenues	$	486,364	$	330,399	$	378,568	$	288,148
Operating income	$	159,881	$	106,335	$	150,412	$	31,641
Net income	$	94,268	$	63,325	$	87,599	$	14,432
Diluted earnings per average common share	$	1.30	$	0.87	$	1.21	$	0.20
Basic earnings per average common share	$	1.31	$	0.88	$	1.22	$	0.20

Alabama Gas Corporation

Quarterly Financial Data [Line Items]

Schedule of quarterly operating results

Alagasco's business is seasonal in character and influenced by weather conditions. The following data summarizes Alagasco's quarterly operating results.

	Year ended December 31, 2012
(in thousands)	First		Second		Third			Fourth
Operating revenues	$	194,487	$	70,887	$	61,809		$	124,406
Operating income (loss)	$	78,560	$	4,448	$	(12,743	)	$	22,951
Net income (loss)	$	46,918	$	326	$	(10,039	)	$	12,197

	Year ended December 31, 2011
(in thousands)	First		Second		Third			Fourth
Operating revenues	$	269,572	$	86,309	$	59,616		$	119,456
Operating income (loss)	$	75,059	$	1,163	$	(10,681	)	$	20,675
Net income (loss)	$	44,175	$	262	$	(9,093	)	$	11,258