CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Plant and property, at original cost:
Electric	$ 2,253,657	$ 2,219,605
Natural gas	77,894	72,834
Other	41,051	39,902
Construction work in progress	184,580	152,330
Total plant and property, Gross	2,557,182	2,484,671
Accumulated depreciation and amortization	740,989	732,737
Total plant and property, Net	1,816,193	1,751,934
Current assets:
Cash and cash equivalents	2,939	3,475
Restricted cash	7,726	2,872
Accounts receivable - trade, net of allowance $944 and $1,025, respectively	48,824	50,137
Accrued unbilled revenues	19,299	26,694
Accounts receivable - other	16,238	13,101
Fuel, materials and supplies	48,800	48,811
Prepaid expenses and other	15,554	15,954
Unrealized gain in fair value of derivative contracts	9,153	2,469
Regulatory assets	10,229	7,743
Total current assets	178,762	171,256
Noncurrent assets and deferred charges:
Regulatory assets	161,389	169,333
Goodwill	39,492	39,492
Unamortized debt issuance costs	8,511	8,826
Unrealized gain in fair value of derivative contracts	39	41
Other	3,395	4,163
Total noncurrent assets and deferred charges	212,826	221,855
Total Assets	2,207,781	2,145,045
Capitalization and Liabilities
Common stock, $1 par value, 43,334,811 and 43,044,185 shares issued and outstanding, respectively	43,335	43,044
Capital in excess of par value	645,236	639,525
Retained earnings	77,626	67,554
Total common stockholders' equity	766,197	750,123
Long-term debt (net of current portion):
Obligations under capital lease	4,023	4,167
First mortgage bonds and secured debt	637,597	637,578
Unsecured debt	101,691	101,683
Total long-term debt	743,311	743,428
Total long-term debt and common stockholders' equity	1,509,508	1,493,551
Current liabilities:
Accounts payable and accrued liabilities	50,525	71,375
Current maturities of long-term debt	283	274
Short-term debt	52,500	4,000
Regulatory liabilities	11,869	5,681
Customer deposits	12,734	12,543
Interest accrued	6,592	6,352
Other current liabilities	2,894	299
Unrealized loss in fair value of derivative contracts	970	1,889
Taxes accrued	14,456	3,386
Total current liabilities	152,823	105,799
Commitments and contingencies (Note 7)
Noncurrent liabilities and deferred credits:
Regulatory liabilities	132,241	132,012
Deferred income taxes	324,663	324,266
Unamortized investment tax credits	18,474	18,431
Pension and other postretirement benefit obligations	52,206	51,405
Unrealized loss in fair value of derivative contracts	2,096	2,799
Other	15,770	16,782
Total noncurrent liabilities and deferred credits	545,450	545,695
Total Capitalization and Liabilities	$ 2,207,781	$ 2,145,045