Consolidated Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 35,343	$ 5,555
Accounts receivable
Allowance for doubtful accounts	(5,684)	(5,694)
Accounts receivable, net of allowance for doubtful accounts of $5,684 and $5,694 at March 31, 2014 and December 31, 2013, respectively	299,118	257,545
Inventories
Storage gas inventory	19,444	32,095
Materials and supplies	16,071	16,601
Liquified natural gas in storage	1,381	3,634
Regulatory assets	1,283	2,756
Income tax receivable	848	5,765
Assets held for sale	1,871	51,104
Deferred income taxes	53,843	41,299
Prepayments and other	9,827	10,877
Total current assets	439,029	427,231
Property, Plant and Equipment
Oil and gas properties, successful efforts method	7,130,801	6,864,375
Less accumulated depreciation, depletion and amortization	1,898,950	1,776,802
Oil and gas properties, net	5,231,851	5,087,573
Utility plant	1,503,696	1,491,433
Less accumulated depreciation	615,519	605,924
Utility plant, net	888,177	885,509
Other property, net	33,690	30,556
Total property, plant and equipment, net	6,153,718	6,003,638
Other Assets
Regulatory assets	82,570	84,890
Other postretirement assets	35,769	35,351
Long-term derivative instruments	2,638	5,439
Deferred charges and other	66,666	65,663
Total other assets	187,643	191,343
TOTAL ASSETS	6,780,390	6,622,212
Current Liabilities
Long-term debt due within one year	60,000	60,000
Notes payable to banks	575,000	539,000
Accounts payable	300,069	250,756
Accrued taxes	55,534	36,228
Customer deposits	21,654	21,692
Amounts due customers	6,397	16,990
Accrued wages and benefits	17,758	33,884
Regulatory liabilities	80,698	49,006
Royalty payable	61,344	51,519
Liabilities related to assets held for sale	3,410	18,545
Other	28,620	32,273
Total current liabilities	1,210,484	1,109,893
Long-term debt	1,328,442	1,343,464
Deferred Credits and Other Liabilities
Asset retirement obligations	110,729	108,533
Pension liabilities	72,465	67,675
Regulatory liabilities	83,240	94,125
Long-term derivative instruments	1,011	398
Deferred income taxes	1,037,898	1,013,245
Other	24,994	26,860
Total deferred credits and other liabilities	1,330,337	1,310,836
Commitments and Contingencies
Shareholders’ Equity
Preferred stock, cumulative $0.01 par value	0	0
Common shareholders’ equity
Common stock, $0.01 par value	757	756
Premium on capital stock	528,632	520,909
Capital surplus	2,802	2,802
Retained earnings	2,519,025	2,476,616
Accumulated other comprehensive income (loss), net of tax
Unrealized gain on hedges, net	10,851	13,362
Pension and postretirement plans	(26,632)	(32,245)
Interest rate swap	(1,010)	(1,184)
Deferred compensation plan	3,241	3,259
Treasury stock, at cost: 2,965,849 shares and 2,967,999 shares at March 31, 2014 and December 31, 2013, respectively	(126,539)	(126,256)
Total shareholders’ equity	2,911,127	2,858,019
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	6,780,390	6,622,212
Alabama Gas Corporation
Current Assets
Cash and cash equivalents	34,069	3,032
Accounts receivable
Gas	109,601	103,301
Other	5,104	5,447
Affiliated companies	3,967	4,662
Allowance for doubtful accounts	(5,000)	(5,000)
Inventories
Storage gas inventory	19,444	32,095
Materials and supplies	5,188	5,471
Liquified natural gas in storage	1,381	3,634
Regulatory assets	1,283	2,756
Income tax receivable	0	3,644
Deferred income taxes	19,820	20,049
Prepayments and other	3,768	4,654
Total current assets	198,625	183,745
Property, Plant and Equipment
Utility plant	1,503,696	1,491,433
Less accumulated depreciation	615,519	605,924
Utility plant, net	888,177	885,509
Other property, net	40	41
Other Assets
Regulatory assets	82,570	84,890
Other postretirement assets	26,813	26,457
Deferred charges and other	17,117	17,433
Total other assets	126,500	128,780
TOTAL ASSETS	1,213,342	1,198,075
Current Liabilities
Notes payable to banks	0	50,000
Accounts payable	52,938	48,653
Accrued taxes	47,247	28,027
Customer deposits	21,654	21,692
Amounts due customers	6,397	16,990
Accrued wages and benefits	6,343	7,682
Regulatory liabilities	80,698	49,006
Other	10,155	10,113
Total current liabilities	225,432	232,163
Long-term debt	249,895	249,923
Deferred Credits and Other Liabilities
Pension liabilities	19,982	20,191
Regulatory liabilities	83,240	94,125
Deferred income taxes	206,669	205,631
Other	11,311	11,462
Total deferred credits and other liabilities	321,202	331,409
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	382,309	350,076
Accumulated other comprehensive income (loss), net of tax
Total shareholders’ equity	416,813	384,580
Total capitalization	666,708	634,503
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,213,342	$ 1,198,075