Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Plant and property, at original cost:
Electric and water	$ 2,219,605	$ 2,176,188
Natural gas	72,834	69,851
Other	39,902	37,983
Construction work in progress	152,330	56,347
Total plant and property, Gross	2,484,671	2,340,369
Accumulated depreciation and amortization	732,737	682,737
Total plant and property, Net	1,751,934	1,657,632
Current assets:
Cash and cash equivalents	3,475	3,375
Restricted cash	2,872	4,357
Accounts receivable - trade, net of allowance of $1,025 and $1,388, respectively	50,137	38,874
Accrued unbilled revenues	26,694	23,254
Accounts receivable - other	13,101	13,277
Fuel, materials and supplies	48,811	61,870
Prepaid expenses and other	15,954	21,806
Unrealized gain in fair value of derivative contracts	2,469	96
Regulatory assets	7,743	6,377
Total current assets	171,256	173,286
Noncurrent assets and deferred charges:
Regulatory assets	169,333	243,958
Goodwill	39,492	39,492
Unamortized debt issuance costs	8,826	7,606
Unrealized gain in fair value of derivative contracts	41	191
Other	4,163	4,204
Total noncurrent assets and deferred charges	221,855	295,451
Total assets	2,145,045	2,126,369
Capitalization and liabilities
Common stock, $1 par value, 100,000,000 shares authorized, 43,044,185 and 42,484,363 shares issued and outstanding, respectively	43,044	42,484
Capital in excess of par value	639,525	628,199
Retained earnings	67,554	47,115
Total common stockholders' equity	750,123	717,798
Long-term debt (net of current portion)
Obligations under capital lease	4,167	4,441
First mortgage bonds and secured debt	637,578	487,541
Unsecured debt	101,683	199,644
Total long-term debt	743,428	691,626
Total long-term debt and common stockholders' equity	1,493,551	1,409,424
Current liabilities:
Accounts payable and accrued liabilities	71,375	66,559
Current maturities of long-term debt	274	714
Short-term debt	4,000	24,000
Regulatory liabilities	5,681	6,303
Customer deposits	12,543	12,001
Interest accrued	6,352	5,902
Unrealized loss in fair value of derivative contracts	1,889	3,403
Taxes accrued	3,386	2,992
Other current liabilities	299
Total current liabilities	105,799	121,874
Commitments and contingencies (Note 11)
Noncurrent liabilities and deferred credits:
Regulatory liabilities	132,012	131,055
Deferred income taxes	324,266	301,967
Unamortized investment tax credits	18,431	18,897
Pension and other postretirement benefit obligations	51,405	120,808
Unrealized loss in fair value of derivative contracts	2,799	3,819
Other	16,782	18,525
Total noncurrent liabilities and deferred credits	545,695	595,071
Total capitalization and liabilities	$ 2,145,045	$ 2,126,369