CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Property, Plant and Equipment:
Utility Plant, at original cost	$ 1,735,375		$ 1,658,790
Accumulated Depreciation	(384,762)		(373,199)
Nonutility Property and Equipment, at cost	351,091		328,638
Accumulated Depreciation	(43,589)		(36,208)
Property, Plant and Equipment - Net	1,658,115		1,578,021
Investments:
Available-for-Sale Securities	7,859		7,538
Restricted	31,783		17,903
Investment in Affiliates	78,388		75,825
Total Investments	118,030		101,266
Current Assets:
Cash and Cash Equivalents	2,260		4,638
Accounts Receivable	246,460		195,293
Unbilled Revenues	14,549		40,938
Provision for Uncollectibles	(6,943)		(5,924)
Notes Receivable - Affiliate	5,287		39,495
Natural Gas in Storage, average cost	58,440		55,517
Materials and Supplies, average cost	2,647		2,618
Prepaid Taxes	18,378		26,187
Derivatives - Energy Related Assets	33,826		24,242
Other Prepayments and Current Assets	18,103		11,833
Total Current Assets	393,007		394,837
Regulatory and Other Noncurrent Assets:
Regulatory Assets	326,406		352,656
Derivatives - Energy Related Assets	14,642		12,297
Unamortized Debt Issuance Costs	7,820		8,226
Notes Receivables-Affiliate	65,828		117,188
Contract Receivables	13,782		13,985
Other	56,867		52,964
Total Regulatory and Other Noncurrent Assets	485,345		557,316
Total Assets	2,654,497		2,631,440
Equity:
Common Stock	39,954		39,567
Premium on Common Stock	359,431		345,807
Treasury Stock (at par)	(169)		(182)
Accumulated Other Comprehensive Loss	(26,234)	[1]	(31,105)	[1]
Retained Earnings	397,611		382,127
Total Equity	770,593		736,214
Long-Term Debt	601,400		601,400
Total Capitalization	1,371,993		1,337,614
Current Liabilities:
Notes Payable	295,700		338,900
Current Portion of Long-Term Debt	25,000		25,000
Accounts Payable	192,381		193,331
Customer Deposits and Credit Balances	17,240		17,757
Environmental Remediation Costs	25,691		21,026
Taxes Accrued	2,462		2,156
Derivatives - Energy Related Liabilities	37,979		23,828
Deferred Income Taxes - Net	5,678		10,812
Deferred Contract Revenues	42		0
Dividends Payable	14,165		0
Interest Accrued	7,629		6,635
Pension Benefits	1,236		1,272
Other Current Liabilities	7,136		11,127
Total Current Liabilities	632,339		651,844
Deferred Credits and Other Noncurrent Liabilities:
Deferred Income Taxes - Net	291,928		289,489
Investment Tax Credits	489		618
Pension and Other Postretirement Benefits	97,283		105,168
Environmental Remediation Costs	88,379		91,072
Asset Retirement Obligations	40,067		39,385
Derivatives - Energy Related Liabilities	25,563		5,403
Derivatives - Other	9,091		13,462
Regulatory Liabilities	60,615		56,517
Finance Obligation	21,150		21,646
Other	15,600		19,222
Total Deferred Credits and Other Noncurrent Liabilities	650,165		641,982
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	$ 2,654,497		$ 2,631,440

[1] Determined using a combined statutory tax rate of 41%.