Consolidated Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 47,137	$ 9,541
Accounts receivable
Allowance for doubtful accounts	(6,649)	(12,946)
Accounts receivable, net of allowance for doubtful accounts of $6,649 at September 30, 2012, and $12,946 at December 31, 2011	194,473	231,925
Inventories
Storage gas inventory	36,849	44,047
Materials and supplies	33,596	26,420
Liquified natural gas in storage	3,505	3,545
Regulatory asset	56,188	57,143
Income tax receivable	5,526	7,343
Deferred income taxes	32,993	48,818
Prepayments and other	16,998	15,386
Total current assets	427,265	444,168
Property, Plant and Equipment
Oil and gas properties, successful efforts method	6,110,988	5,166,368
Less accumulated depreciation, depletion and amortization	1,662,144	1,382,526
Oil and gas properties, net	4,448,844	3,783,842
Utility plant	1,395,454	1,358,266
Less accumulated depreciation	560,279	544,838
Utility plant, net	835,175	813,428
Other property, net	23,953	23,506
Total property, plant and equipment, net	5,307,972	4,620,776
Other Assets
Regulatory asset	94,869	95,633
Long-term derivative instruments	43,137	31,056
Deferred charges and other	46,586	45,783
Total other assets	184,592	172,472
TOTAL ASSETS	5,919,829	5,237,416
Current Liabilities
Long-term debt due within one year	0	1,000
Notes payable to banks	480,000	15,000
Accounts payable	264,930	302,048
Affiliated Companies		0
Accrued taxes	55,416	32,359
Customers' deposits	23,563	23,950
Amounts due customers	21,828	21,065
Accrued wages and benefits	24,618	35,258
Regulatory liability	27,372	58,279
Royalty payable	38,313	22,592
Other	27,191	32,328
Total current liabilities	963,231	543,879
Long-term debt	1,153,591	1,153,700
Deferred Credits and Other Liabilities
Asset retirement obligation	115,191	107,340
Pension and other postretirement liabilities	82,993	62,532
Regulatory liability	77,692	87,234
Long-term derivative instruments	11,110	34,663
Deferred income taxes	885,839	806,127
Other	9,093	9,778
Total deferred credits and other liabilities	1,181,918	1,107,674
Commitments and Contingencies
Shareholders' Equity
Preferred stock, cumulative $0.01 par value	0	0
Common shareholders' equity
Common stock, $0.01 par value	751	750
Premium on capital stock	491,416	482,918
Capital surplus	2,802	2,802
Retained earnings	2,261,332	2,100,885
Accumulated other comprehensive loss, net of tax
Unrealized gain (loss) on hedges, net	35,897	9,273
Pension and postretirement plans	(43,542)	(38,584)
Interest rate swap	(2,398)	(941)
Deferred compensation plan	3,433	3,511
Treasury stock, at cost; 3,031,622 shares at September 30, 2012, and 3,036,549 shares at December 31, 2011	(128,602)	(128,451)
Total shareholders' equity	2,621,089	2,432,163
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	5,919,829	5,237,416
Alabama Gas Corporation
Current Assets
Cash and cash equivalents	10,286	7,817
Accounts receivable
Gas	38,014	96,812
Other	5,092	6,858
Affiliated companies	0	2,841
Allowance for doubtful accounts	(5,800)	(12,100)
Inventories
Storage gas inventory	36,849	44,047
Materials and supplies	5,446	4,183
Liquified natural gas in storage	3,505	3,545
Regulatory asset	56,188	57,143
Income tax receivable	3,760	9,762
Deferred income taxes	19,718	21,986
Prepayments and other	6,336	4,422
Total current assets	179,394	247,316
Property, Plant and Equipment
Utility plant	1,395,454	1,358,266
Less accumulated depreciation	560,279	544,838
Utility plant, net	835,175	813,428
Other property, net	42	43
Other Assets
Regulatory asset	94,869	95,633
Deferred charges and other	10,681	10,380
Total other assets	105,550	106,013
TOTAL ASSETS	1,120,161	1,166,800
Current Liabilities
Notes payable to banks	25,000	15,000
Accounts payable	53,899	110,552
Affiliated Companies	24,867
Accrued taxes	24,689	26,861
Customers' deposits	23,563	23,950
Amounts due customers	21,828	21,065
Accrued wages and benefits	7,533	12,971
Regulatory liability	27,372	58,279
Other	9,516	9,250
Total current liabilities	218,267	277,928
Long-term debt	250,103	250,246
Deferred Credits and Other Liabilities
Pension and other postretirement liabilities	31,069	21,383
Regulatory liability	77,692	87,234
Long-term derivative instruments	0	3,070
Deferred income taxes	188,509	181,492
Other	760	709
Total deferred credits and other liabilities	298,030	293,888
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	319,257	310,234
Accumulated other comprehensive loss, net of tax
Total shareholders' equity	353,761	344,738
Total capitalization	603,864	594,984
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,120,161	$ 1,166,800