Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATIONS:
Net income	$ 26,996	$ 27,405
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	52,591	52,837
Amortization of regulatory assets	261	1,395
Amortization of debt premium	710	30
Deferred income taxes and investment tax credit adjustments - net	(6,509)	12,942
Allowance for equity funds used during construction	(6,425)	(6,684)
Change in certain assets and liabilities:
Accounts receivable	15,440	(2,813)
Fuel, materials and supplies	(4,721)	6,874
Increase (Decrease) in Income Taxes Payable	(18,692)	0
Income taxes receivable or payable	3,134	2,726
Accounts payable and accrued expenses	(12,343)	688
Accrued real estate and personal property taxes	4,614	3,653
Accrued interest	9,660	6,343
Pension and other postretirement benefit expenses	(10,135)	(18,464)
Short-term and long-term regulatory assets and liabilities	6,588	(10,544)
Prepaids and other current assets	(6,971)	(9,433)
Other - net	(3,306)	1,835
Net cash provided by operating activities	88,276	68,790
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures - utility	(64,298)	(234,516)
Project development costs	(333)	(195)
Cost of removal, net of salvage	(2,656)	(5,556)
Other	(395)	(696)
Net cash used in investing activities	(67,682)	(240,963)
CASH FLOWS FROM FINANCING ACTIVITIES:
Short-term debt borrowings	25,000	148,000
Short-term debt repayments	(15,000)	(83,000)
Dividends on common stock	(25,099)	(24,500)
Issuance of common stock	0	134,276
Preferred dividends of subsidiary	(803)	(803)
Deferred financing costs paid	(107)	(45)
Payments for financed capital expenditures	(4,900)	(3,198)
Other	(228)	(154)
Net cash (used in) provided by financing activities	(21,137)	170,576
Net change in cash and cash equivalents	(543)	(1,597)
Cash and cash equivalents at beginning of period	34,953	21,521
Cash and cash equivalents at end of period	34,410	19,924
Cash paid during the period for:
Interest (net of amount capitalized)	14,310	14,655
Income taxes	0	0
Non-cash investing activities:
Accruals for capital expenditures	$ 21,983	$ 81,371