Consolidated Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 12,413	$ 9,704
Accounts receivable
Allowance for doubtful accounts	(5,296)	(6,549)
Accounts receivable, net of allowance for doubtful accounts of $6,070 at September 30, 2013, and $6,549 at December 31, 2012	200,043	277,900
Inventories
Storage gas inventory	39,507	32,205
Materials and supplies	19,187	28,291
Liquified natural gas in storage	2,990	3,498
Regulatory asset	11,213	45,515
Income tax receivable	7,653	6,664
Assets held for sale	183,862	0
Deferred income taxes	42,722	8,520
Prepayments and other	12,996	12,823
Total current assets	532,586	425,120
Property, Plant and Equipment
Oil and gas properties, successful efforts method	6,655,343	6,439,127
Less accumulated depreciation, depletion and amortization	1,657,682	1,765,241
Oil and gas properties, net	4,997,661	4,673,886
Utility plant	1,471,174	1,416,590
Less accumulated depreciation	594,604	573,947
Utility plant, net	876,570	842,643
Other property, net	29,733	25,107
Total property, plant and equipment, net	5,903,964	5,541,636
Other Assets
Regulatory asset	89,004	110,566
Pension and other postretirement assets	17,417	1,404
Long-term derivative instruments	12,786	40,577
Deferred charges and other	59,115	56,587
Total other assets	178,322	209,134
TOTAL ASSETS	6,614,872	6,175,890
Current Liabilities
Long-term debt due within one year	125,000	50,000
Notes payable to banks	901,000	643,000
Accounts payable	256,109	257,579
Accrued taxes	51,878	30,076
Customers’ deposits	20,531	24,705
Amounts due customers	19,974	19,718
Accrued wages and benefits	25,896	24,984
Regulatory liability	40,168	45,116
Royalty payable	49,976	34,426
Liabilities related to assets held for sale	23,945	0
Other	26,812	30,178
Total current liabilities	1,541,289	1,159,782
Long-term debt	1,028,509	1,103,528
Deferred Credits and Other Liabilities
Asset retirement obligation	106,604	118,023
Pension and other postretirement liabilities	90,893	110,282
Regulatory liability	81,414	80,404
Long-term derivative instruments	1,961	11,305
Deferred income taxes	979,898	905,601
Other	14,638	10,275
Total deferred credits and other liabilities	1,275,408	1,235,890
Commitments and Contingencies
Shareholders’ Equity
Preferred stock, cumulative $0.01 par value	0	0
Common shareholders’ equity
Common stock, $0.01 par value	755	751
Premium on capital stock	514,784	492,108
Capital surplus	2,802	2,802
Retained earnings	2,403,062	2,314,055
Accumulated other comprehensive income (loss), net of tax
Unrealized gain on hedges, net	16,730	46,352
Pension and postretirement plans	(43,629)	(52,507)
Interest rate swap	(1,365)	(2,156)
Deferred compensation plan	3,319	2,774
Treasury stock, at cost: 2,977,920 shares at September 30, 2013, and 2,998,620 shares at December 31, 2012	(126,792)	(127,489)
Total shareholders’ equity	2,769,666	2,676,690
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	6,614,872	6,175,890
Alabama Gas Corporation
Current Assets
Cash and cash equivalents	8,541	5,559
Accounts receivable
Gas	39,962	94,011
Other	4,655	5,117
Affiliated companies	6,579	5,742
Allowance for doubtful accounts	(5,300)	(5,700)
Inventories
Storage gas inventory	39,507	32,205
Materials and supplies	5,401	5,528
Liquified natural gas in storage	2,990	3,498
Regulatory asset	11,213	45,515
Income tax receivable	1,601	2,762
Deferred income taxes	22,314	18,799
Prepayments and other	6,595	4,451
Total current assets	144,058	217,487
Property, Plant and Equipment
Utility plant	1,471,174	1,416,590
Less accumulated depreciation	594,604	573,947
Utility plant, net	876,570	842,643
Other property, net	41	42
Other Assets
Regulatory asset	89,004	110,566
Pension and other postretirement assets	13,399	848
Deferred charges and other	10,994	11,290
Total other assets	113,397	122,704
TOTAL ASSETS	1,134,066	1,182,876
Current Liabilities
Notes payable to banks	49,000	77,000
Accounts payable	32,997	51,741
Accrued taxes	28,635	24,186
Customers’ deposits	20,531	24,705
Amounts due customers	19,974	19,718
Accrued wages and benefits	8,154	6,703
Regulatory liability	40,168	45,116
Other	9,293	9,018
Total current liabilities	208,752	258,187
Long-term debt	249,973	250,028
Deferred Credits and Other Liabilities
Pension and other postretirement liabilities	28,371	43,611
Regulatory liability	81,414	80,404
Deferred income taxes	199,372	189,381
Other	1,446	762
Total deferred credits and other liabilities	310,603	314,158
Commitments and Contingencies
Shareholders’ Equity
Preferred stock, cumulative $0.01 par value	0	0
Common shareholders’ equity
Common stock, $0.01 par value	20	20
Premium on capital stock	31,682	31,682
Capital surplus	2,802	2,802
Retained earnings	330,234	325,999
Accumulated other comprehensive income (loss), net of tax
Total shareholders’ equity	364,738	360,503
Total capitalization	614,711	610,531
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,134,066	$ 1,182,876