Consolidated Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 3,793	$ 9,704
Accounts receivable
Allowance for doubtful accounts	(5,296)	(6,549)
Accounts receivable, net of allowance for doubtful accounts of $5,296 at June 30, 2013, and $6,549 at December 31, 2012	226,255	277,900
Inventories
Storage gas inventory	21,231	32,205
Materials and supplies	19,835	28,291
Liquified natural gas in storage	3,092	3,498
Regulatory asset	10,915	45,515
Income tax receivable	996	6,664
Assets held for sale	130,743	0
Deferred income taxes	21,701	8,520
Prepayments and other	8,338	12,823
Total current assets	446,899	425,120
Property, Plant and Equipment
Oil and gas properties, successful efforts method	6,757,512	6,439,127
Less accumulated depreciation, depletion and amortization	1,805,307	1,765,241
Oil and gas properties, net	4,952,205	4,673,886
Utility plant	1,454,659	1,416,590
Less accumulated depreciation	588,459	573,947
Utility plant, net	866,200	842,643
Other property, net	31,535	25,107
Total property, plant and equipment, net	5,849,940	5,541,636
Other Assets
Regulatory asset	107,189	110,566
Pension and other postretirement assets	1,962	1,404
Long-term derivative instruments	39,006	40,577
Deferred charges and other	60,167	56,587
Total other assets	208,324	209,134
TOTAL ASSETS	6,505,163	6,175,890
Current Liabilities
Long-term debt due within one year	100,000	50,000
Notes payable to banks	800,000	643,000
Accounts payable	273,531	257,579
Accrued taxes	58,540	30,076
Customers' deposits	24,403	24,705
Amounts due customers	10,956	19,718
Accrued wages and benefits	19,904	24,984
Regulatory liability	27,581	45,116
Royalty payable	41,417	34,426
Liabilities related to assets held for sale	7,917	0
Other	32,187	30,178
Total current liabilities	1,396,436	1,159,782
Long-term debt	1,053,542	1,103,528
Deferred Credits and Other Liabilities
Asset retirement obligation	119,029	118,023
Pension and other postretirement liabilities	109,086	110,282
Regulatory liability	68,934	80,404
Long-term derivative instruments	470	11,305
Deferred income taxes	963,727	905,601
Other	12,462	10,275
Total deferred credits and other liabilities	1,273,708	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	751	751
Premium on capital stock	496,339	492,108
Capital surplus	2,802	2,802
Retained earnings	2,432,869	2,314,055
Accumulated other comprehensive income (loss), net of tax
Unrealized gain on hedges, net	21,890	46,352
Pension and postretirement plans	(49,239)	(52,507)
Interest rate swap	(1,305)	(2,156)
Deferred compensation plan	3,445	2,774
Treasury stock, at cost: 2,971,254 shares at June 30, 2013, and 2,998,620 shares at December 31, 2012	(126,075)	(127,489)
Total shareholders' equity	2,781,477	2,676,690
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	6,505,163	6,175,890
Alabama Gas Corporation
Current Assets
Cash and cash equivalents	565	5,559
Accounts receivable
Gas	47,757	94,011
Other	8,122	5,117
Affiliated companies	3,364	5,742
Allowance for doubtful accounts	(4,600)	(5,700)
Inventories
Storage gas inventory	21,231	32,205
Materials and supplies	5,396	5,528
Liquified natural gas in storage	3,092	3,498
Regulatory asset	10,915	45,515
Income tax receivable	0	2,762
Assets held for sale	3,011	0
Deferred income taxes	20,712	18,799
Prepayments and other	1,645	4,451
Total current assets	121,210	217,487
Property, Plant and Equipment
Utility plant	1,454,659	1,416,590
Less accumulated depreciation	588,459	573,947
Utility plant, net	866,200	842,643
Other property, net	41	42
Other Assets
Regulatory asset	107,189	110,566
Pension and other postretirement assets	1,259	848
Deferred charges and other	10,905	11,290
Total other assets	119,353	122,704
TOTAL ASSETS	1,106,804	1,182,876
Current Liabilities
Notes payable to banks	0	77,000
Accounts payable	43,982	51,741
Accrued taxes	40,005	24,186
Customers' deposits	24,403	24,705
Amounts due customers	10,956	19,718
Accrued wages and benefits	4,768	6,703
Regulatory liability	27,581	45,116
Other	9,493	9,018
Total current liabilities	161,188	258,187
Long-term debt	250,018	250,028
Deferred Credits and Other Liabilities
Pension and other postretirement liabilities	41,348	43,611
Regulatory liability	68,934	80,404
Deferred income taxes	195,649	189,381
Other	1,522	762
Total deferred credits and other liabilities	307,453	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	353,641	325,999
Accumulated other comprehensive income (loss), net of tax
Total shareholders' equity	388,145	360,503
Total capitalization	638,163	610,531
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,106,804	$ 1,182,876