Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$ 14,637	$ 20,905
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization including regulatory items	23,056	19,491
Pension and other postretirement benefit costs, net of contributions	1,704	3,320
Deferred income taxes and unamortized investment tax credit, net	7,203	2,145
Allowance for equity funds used during construction	(978)	(1,252)
Stock compensation expense	651	1,381
Non-cash (gain)/loss on derivatives	772	(683)
Cash flows impacted by changes in:
Accounts receivable and accrued unbilled revenues	12,475	7,326
Fuel, materials and supplies	1,632	4,290
Prepaid expenses, other current assets and deferred charges	2,984	(1,326)
Accounts payable and accrued liabilities	(28,343)	(22,873)
Interest, taxes accrued and customer deposits	15,159	20,781
Asset retirement obligation		(17)
Other liabilities and other deferred credits	3,800	1,084
Net cash provided by operating activities	54,752	54,572
Investing activities:
Capital expenditures - regulated	(52,954)	(45,882)
Capital expenditures and other investments - non-regulated	(520)	(481)
Restricted cash		596
Total net cash used in investing activities	(53,474)	(45,767)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	1,664	2,416
Net short-term borrowings	9,000	500
Dividends	(11,318)	(10,994)
Other	(68)	(57)
Net cash used in financing activities	(722)	(8,135)
Net increase in cash and cash equivalents	556	670
Cash and cash equivalents at beginning of period	2,105	3,475
Cash and cash equivalents at end of period	$ 2,661	$ 4,145