Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets
Cash and Cash Equivalents
Accounts Receivable:
Trade—Net	79,029	68,242
Other	7,895	5,850
Inventories	87,267	83,740
Unbilled Revenues	15,560	20,080
Income Taxes Receivable		662
Regulatory Assets	16,540	21,297
Other	14,352	8,144
Total Current Assets	220,643	208,015
Investments	8,156	8,417
Other Assets	35,253	34,104
Balance	37,572	37,572
Other Intangibles—Net	14,391	14,958
Regulatory Assets	127,479	132,094
Plant
Electric Plant in Service	1,870,928	1,860,357
Nonelectric Operations	214,925	211,826
Construction Work in Progress	188,450	153,261
Total Gross Plant	2,274,303	2,225,444
Less Accumulated Depreciation and Amortization	773,741	748,219
Net Plant	1,500,562	1,477,225
Total Assets	1,944,056	1,912,385
Current Liabilities
Short-Term Debt	58,117	42,883
Current Maturities of Long-Term Debt	42,200	33,201
Accounts Payable	94,353	89,350
Accrued Salaries and Wages	15,115	17,497
Accrued Taxes	10,954	16,000
Other Accrued Liabilities	15,142	15,377
Liabilities of Discontinued Operations	1,113	1,363
Total Current Liabilities	236,994	215,671
Pensions Benefit Liability	98,297	97,627
Other Postretirement Benefits Liability	62,980	62,571
Other Noncurrent Liabilities	22,441	21,706
Commitments and Contingencies (note 9)
Deferred Credits
Deferred Income Taxes	235,554	226,591
Deferred Tax Credits	22,115	22,849
Regulatory Liabilities	83,561	82,433
Other	5,324	7,492
Total Deferred Credits	346,554	339,365
Capitalization
Long-Term Debt—Net	490,386	505,341
Common Shares, Par Value $5 Per Share—Authorized, 50,000,000 Shares; Outstanding, 2017—39,555,076 Shares; 2016—39,348,136 Shares	197,775	196,741
Premium on Common Shares	341,657	337,684
Retained Earnings	150,558	139,479
Accumulated Other Comprehensive Loss	(3,586)	(3,800)
Total Common Equity	686,404	670,104
Total Capitalization	1,176,790	1,175,445
Total Liabilities and Equity	1,944,056	1,912,385
Cumulative Preferred Shares [Member]
Capitalization
Cumulative Shares
Cumulative Preference Shares [Member]
Capitalization
Cumulative Shares