CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment:
Utility Plant, at original cost	$ 1,590,771	$ 1,515,274
Accumulated Depreciation	(367,710)	(357,245)
Nonutility Property and Equipment, at cost	231,968	221,051
Accumulated Depreciation	(31,608)	(26,687)
Property, Plant and Equipment - Net	1,423,421	1,352,393
Investments:
Available-for-Sale Securities	7,022	6,677
Restricted	10,884	18,658
Investment in Affiliates	60,604	31,815
Total Investments	78,510	57,150
Current Assets:
Cash and Cash Equivalents	1,633	7,538
Accounts Receivable	131,727	135,253
Unbilled Revenues	12,299	42,961
Provision for Uncollectibles	(6,250)	(5,337)
Notes Receivable - Affiliate	38,626	2,747
Natural Gas in Storage, average cost	50,935	68,823
Materials and Supplies, average cost	2,888	2,794
Deferred Income Taxes - Net	0	12,779
Prepaid Taxes	27,938	22,303
Derivatives - Energy Related Assets	31,254	37,461
Other Prepayments and Current Assets	13,396	13,287
Total Current Assets	304,446	340,609
Regulatory and Other Noncurrent Assets:
Regulatory Assets	316,256	315,221
Derivatives - Energy Related Assets	10,397	8,135
Unamortized Debt Issuance Costs	8,727	7,009
Notes Receivables-Affiliate	125,267	111,946
Contract Receivables	13,503	13,280
Other	45,464	41,767
Total Regulatory and Other Noncurrent Assets	519,614	497,358
Total Assets	2,325,991	2,247,510
Equity:
Common Stock	38,052	37,765
Premium on Common Stock	283,655	273,303
Treasury Stock (at par)	(180)	(193)
Accumulated Other Comprehensive Loss	(30,410)	(28,438)
Retained Earnings	381,633	341,677
Total Equity	672,750	624,114
Long-Term Debt	541,400	424,213
Total Capitalization	1,214,150	1,048,327
Current Liabilities:
Notes Payable	323,300	321,400
Current Portion of Long-Term Debt	0	2,187
Accounts Payable	109,882	153,666
Customer Deposits and Credit Balances	20,457	24,914
Environmental Remediation Costs	23,908	24,721
Taxes Accrued	2,068	3,168
Derivatives - Energy Related Liabilities	19,340	38,738
Deferred Income Taxes - Net	7,094	0
Deferred Contract Revenues	121	996
Dividends Payable	12,253	0
Interest Accrued	6,224	6,408
Pension and Other Postretirement Benefits	1,240	1,275
Other Current Liabilities	5,954	10,498
Total Current Liabilities	531,841	587,971
Deferred Credits and Other Noncurrent Liabilities:
Deferred Income Taxes - Net	287,034	295,434
Investment Tax Credits	761	905
Pension and Other Postretirement Benefits	89,073	109,021
Environmental Remediation Costs	69,140	69,439
Asset Retirement Obligations	29,931	29,430
Derivatives - Energy Related Liabilities	5,574	7,367
Derivatives - Other	14,821	14,046
Regulatory Liabilities	47,946	48,311
Finance Obligation	22,094	22,549
Other	13,626	14,710
Total Deferred Credits and Other Noncurrent Liabilities	580,000	611,212
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	$ 2,325,991	$ 2,247,510