Consolidated Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 49,618	$ 9,541
Accounts receivable
Allowance for doubtful accounts	(7,744)	(12,946)
Accounts receivable, net of allowance for doubtful accounts of $7,744 at March 31, 2012, and $12,946 at December 31, 2011	203,642	231,925
Inventories
Storage gas inventory	37,986	44,047
Materials and supplies	30,930	26,420
Liquified natural gas in storage	3,623	3,545
Regulatory asset	54,790	57,143
Income tax receivable	1,491	7,343
Deferred income taxes	39,471	48,818
Prepayments and other	14,952	15,386
Total current assets	436,503	444,168
Property, Plant and Equipment
Oil and gas properties, successful efforts method	5,491,919	5,166,368
Less accumulated depreciation, depletion and amortization	1,486,756	1,382,526
Oil and gas properties, net	4,005,163	3,783,842
Utility plant	1,369,107	1,358,266
Less accumulated depreciation	550,687	544,838
Utility plant, net	818,420	813,428
Other property, net	23,827	23,506
Total property, plant and equipment, net	4,847,410	4,620,776
Other Assets
Regulatory asset	91,478	95,633
Long-term derivative instruments	10,608	31,056
Deferred charges and other	46,773	45,783
Total other assets	148,859	172,472
TOTAL ASSETS	5,432,772	5,237,416
Current Liabilities
Long-term debt due within one year	1,000	1,000
Notes payable to banks	165,000	15,000
Accounts payable	340,633	302,048
Accrued taxes	34,434	32,359
Customers' deposits	25,174	23,950
Amounts due customers	10,755	21,065
Accrued wages and benefits	18,417	35,258
Regulatory liability	30,049	58,279
Royalty payable	23,606	22,592
Other	24,963	32,328
Total current liabilities	674,031	543,879
Long-term debt	1,153,686	1,153,700
Deferred Credits and Other Liabilities
Asset retirement obligation	110,209	107,340
Pension and other postretirement liabilities	63,031	62,532
Regulatory liability	74,159	87,234
Long-term derivative instruments	61,066	34,663
Deferred income taxes	813,451	806,127
Other	9,315	9,778
Total deferred credits and other liabilities	1,131,231	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	750	750
Premium on capital stock	488,463	482,918
Capital surplus	2,802	2,802
Retained earnings	2,148,196	2,100,885
Accumulated other comprehensive loss, net of tax
Unrealized gain (loss) on hedges, net	(2,468)	9,273
Pension and postretirement plans	(37,716)	(38,584)
Interest rate swap	(1,179)	(941)
Deferred compensation plan	3,715	3,511
Treasury stock, at cost; 3,040,117 shares at March 31, 2012, and 3,036,549 shares at December 31, 2011	(128,739)	(128,451)
Total shareholders' equity	2,473,824	2,432,163
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	5,432,772	5,237,416
Alabama Gas Corporation
Current Assets
Cash and cash equivalents	39,974	7,817
Accounts receivable
Gas	56,944	96,812
Other	5,349	6,858
Affiliated companies	3,356	2,841
Allowance for doubtful accounts	(6,900)	(12,100)
Inventories
Storage gas inventory	37,986	44,047
Materials and supplies	4,181	4,183
Liquified natural gas in storage	3,623	3,545
Regulatory asset	54,790	57,143
Income tax receivable	1,388	9,762
Deferred income taxes	21,433	21,986
Prepayments and other	3,716	4,422
Total current assets	225,840	247,316
Property, Plant and Equipment
Utility plant	1,369,107	1,358,266
Less accumulated depreciation	550,687	544,838
Utility plant, net	818,420	813,428
Other property, net	42	43
Other Assets
Regulatory asset	91,478	95,633
Deferred charges and other	10,357	10,380
Total other assets	101,835	106,013
TOTAL ASSETS	1,146,137	1,166,800
Current Liabilities
Notes payable to banks	25,000	15,000
Accounts payable	81,811	110,552
Accrued taxes	43,060	26,861
Customers' deposits	25,174	23,950
Amounts due customers	10,755	21,065
Accrued wages and benefits	5,828	12,971
Regulatory liability	30,049	58,279
Other	9,694	9,250
Total current liabilities	231,371	277,928
Long-term debt	250,221	250,246
Deferred Credits and Other Liabilities
Pension and other postretirement liabilities	21,945	21,383
Regulatory liability	74,159	87,234
Long-term derivative instruments	0	3,070
Deferred income taxes	184,136	181,492
Other	676	709
Total deferred credits and other liabilities	280,916	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	349,125	310,234
Accumulated other comprehensive loss, net of tax
Total shareholders' equity	383,629	344,738
Total capitalization	633,850	594,984
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,146,137	$ 1,166,800