CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment:
Utility Plant, at original cost	$ 2,310,223	$ 2,211,239
Accumulated Depreciation	(459,015)	(440,473)
Nonutility Property and Equipment, at cost	792,256	785,646
Accumulated Depreciation	(128,574)	(108,307)
Property, Plant and Equipment - Net	2,514,890	2,448,105
Investments:
Available-for-Sale Securities	15,160	14,810
Restricted	38,177	48,758
Investment in Affiliates	22,168	16,983
Total Investments	75,505	80,551
Current Assets:
Cash and Cash Equivalents	4,160	3,877
Accounts Receivable	175,341	178,359
Unbilled Revenues	29,385	40,044
Provision for Uncollectibles	(10,118)	(10,252)
Notes Receivable	11,843	11,800
Notes Receivable - Affiliate	1,868	3,134
Natural Gas in Storage, average cost	44,499	54,211
Materials and Supplies, average cost	6,815	5,088
Prepaid Taxes	27,922	21,753
Derivatives - Energy Related Assets	45,112	83,093
Other Prepayments and Current Assets	38,930	40,167
Total Current Assets	375,757	431,274
Regulatory and Other Noncurrent Assets:
Regulatory Assets	380,364	323,434
Derivatives - Energy Related Assets	11,929	16,238
Notes Receivable - Affiliate	13,275	13,275
Contract Receivables	28,976	28,609
Notes Receivable	31,187	35,439
Goodwill	8,139	8,880
Identifiable Intangible Assets	16,209	21,553
Other	66,350	64,575
Total Regulatory and Other Noncurrent Assets	556,429	512,003
Total Assets	3,522,581	3,471,933
Equity:
Common Stock	99,347	88,707
Premium on Common Stock	705,106	499,460
Treasury Stock (at par)	(259)	(296)
Accumulated Other Comprehensive Loss	(24,295)	(24,499)
Retained Earnings	497,648	474,167
Total Equity	1,277,547	1,037,539
Long-Term Debt	831,089	997,427
Total Capitalization	2,108,636	2,034,966
Current Liabilities:
Notes Payable	145,400	431,700
Current Portion of Long-Term Debt	244,605	29,454
Accounts Payable	166,418	186,400
Customer Deposits and Credit Balances	23,022	20,146
Environmental Remediation Costs	72,315	50,559
Taxes Accrued	2,832	2,336
Derivatives - Energy Related Liabilities	66,444	90,708
Derivative Liability, Current	945	0
Dividends Payable	20,962	0
Interest Accrued	7,176	7,316
Pension Benefits	2,261	2,261
Other Current Liabilities	6,053	11,596
Total Current Liabilities	758,433	832,476
Deferred Credits and Other Noncurrent Liabilities:
Deferred Income Taxes - Net	330,046	295,945
Pension and Other Postretirement Benefits	79,821	76,068
Environmental Remediation Costs	83,495	76,064
Asset Retirement Obligations	59,032	57,943
Derivatives - Energy Related Liabilities	8,371	21,697
Derivatives - Other	13,386	10,943
Regulatory Liabilities	60,010	42,841
Other	21,351	22,990
Total Deferred Credits and Other Noncurrent Liabilities	655,512	604,491
Commitments and Contingencies
Total Capitalization and Liabilities	$ 3,522,581	$ 3,471,933