CONDENSED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment:
Utility Plant, at original cost	$ 2,358,302	$ 2,211,239
Accumulated Depreciation	(467,359)	(440,473)
Property, Plant and Equipment - Net	1,890,943	1,770,766
Investments:
Available-for-Sale Securities	9,260	8,788
Restricted Investments	8,332	6,769
Total Investments	17,592	15,557
Current Assets:
Cash and Cash Equivalents	1,167	775
Note Receivable	0	9,916
Accounts Receivable	59,020	64,445
Accounts Receivable - Related Parties	1,680	1,972
Unbilled Revenues	13,432	25,613
Provision for Uncollectibles	(11,055)	(9,778)
Natural Gas in Storage, average cost	13,930	14,294
Materials and Supplies, average cost	931	937
Prepaid Taxes	24,385	21,483
Derivatives - Energy Related Assets	2,281	1,077
Other Prepayments and Current Assets	15,782	13,405
Total Current Assets	121,553	144,139
Regulatory and Other Noncurrent Assets:
Regulatory Assets	397,071	323,434
Long-Term Receivables	25,370	24,950
Derivatives - Energy Related Assets	281	64
Other	3,502	2,666
Total Regulatory and Other Noncurrent Assets	426,224	351,114
Total Assets	2,456,312	2,281,576
Common Equity:
Common Stock, Par Value $2.50 per share: Authorized - 4,000,000 shares, Outstanding - 2,339,139 shares	5,848	5,848
Other Paid-In Capital and Premium on Common Stock	315,827	250,827
Accumulated Other Comprehensive Loss	(12,796)	(12,862)
Retained Earnings	510,260	464,114
Total Common Equity	819,139	707,927
Long-Term Debt (see Note 1)	423,983	577,454
Total Capitalization	1,243,122	1,285,381
Current Liabilities:
Notes Payable	81,000	134,400
Current Portion of Long-Term Debt	215,909	27,909
Accounts Payable - Commodity	10,933	8,936
Accounts Payable - Other	26,121	40,579
Accounts Payable - Related Parties	5,668	7,552
Derivatives - Energy Related Liabilities	3,276	5,489
Derivatives - Other Current	535	0
Customer Deposits and Credit Balances	41,497	19,531
Environmental Remediation Costs	58,174	48,323
Taxes Accrued	1,678	1,930
Pension Benefits	2,227	2,227
Interest Accrued	4,641	5,989
Other Current Liabilities	3,564	5,686
Total Current Liabilities	455,223	308,551
Regulatory and Other Noncurrent Liabilities:
Regulatory Liabilities	51,050	42,841
Deferred Income Taxes - Net	460,464	432,674
Environmental Remediation Costs	102,413	74,871
Asset Retirement Obligations	58,377	57,219
Pension and Other Postretirement Benefits	70,564	65,491
Derivatives - Energy Related Liabilities	73	351
Derivatives - Other Noncurrent	9,811	7,631
Other	5,215	6,566
Total Regulatory and Other Noncurrent Liabilities	757,967	687,644
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 2,456,312	$ 2,281,576