CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
OPERATING ACTIVITIES:
Net Income	$ 43,545	$ 40,409
Items not affecting cash:
Depreciation	50,381	45,872
Amortization of debt issue costs, discount and deferred hedge gain	798	1,030
Amortization of restricted stock	1,066	861
Equity portion of allowance for funds used during construction	(552)	(2,585)
(Gain) loss on sale of assets	(13)	628
Deferred income taxes	25,557	20,131
Changes in current assets and liabilities:
Restricted cash	(1,159)	(1,204)
Accounts receivable	36,787	51,774
Inventories	6,407	5,240
Other current assets	(4,141)	2,874
Accounts payable	(18,900)	(29,005)
Accrued expenses	7,868	12,147
Regulatory assets	9,091	(4,901)
Regulatory liabilities	2,111	(9,403)
Other noncurrent assets	(4,112)	6,059
Other noncurrent liabilities	8,726	(7,469)
Cash provided by operating activities	163,460	132,458
INVESTING ACTIVITIES:
Property, plant, and equipment additions	(71,857)	(116,233)
Proceeds from sale of assets	209	0
Cash used in investing activities	(71,648)	(116,233)
FINANCING ACTIVITIES:
Treasury stock activity	125	88
Dividends on common stock	(25,952)	(24,494)
Issuance of long-term debt	0	225,000
Repayment on long-term debt	(3,626)	(228,403)
Line of credit borrowings	80,000	402,000
Line of credit repayments	(233,000)	(382,000)
Issuances of short-term borrowings, net	89,988	0
Financing costs	(1,041)	(6,611)
Cash used in financing activities	(93,506)	(14,420)
(Decrease) Increase in Cash and Cash Equivalents	(1,694)	1,805
Cash and Cash Equivalents, beginning of period	6,234	4,344
Cash and Cash Equivalents, end of period	4,540	6,149
Cash paid during the period for:
Income Taxes	18	0
Interest	20,060	22,086
Significant non-cash transactions:
Capital expenditures included in accounts payable	$ 4,740	$ 2,788