Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net income	[1]	$ 67,830	$ 88,014
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	[1]	91,731	86,397
Other amortization	[1]	4,792	4,014
Provision for loan losses	[1]	2,439	2,016
Loans receivable originated and purchased, held for sale	[1]	(168,921)	(69,656)
Proceeds from sale of loans receivable, held for sale	[1]	173,267	75,040
Increase (decrease) in deferred income taxes	[1]	(4,463)	44,494
Share-based compensation expense	[1]	3,769	5,206
Excess tax benefits from share-based payment arrangements	[1]	(984)	(267)
Allowance for equity funds used during construction	[1]	(3,309)	(2,996)
Change in cash overdraft	[1]	193	(1,038)
Changes in assets and liabilities
Decrease (increase) in accounts receivable and unbilled revenues, net	[1]	44,489	(2,986)
Increase in fuel oil stock	[1]	(2,362)	(27,206)
Increase in regulatory assets	[1]	(19,976)	(17,731)
Increase (decrease) in accounts, interest and dividends payable	[1]	8,504	(40,230)
Change in prepaid and accrued income taxes and utility revenue taxes	[1]	(4,390)	(32,510)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability	[1]	218	(1,714)
Change in other assets and liabilities	[1]	(24,455)	(38,540)
Net cash provided by operating activities	[1]	168,372	70,307
Cash flows from investing activities
Available-for-sale investment securities purchased	[1]	(208,110)	(125,531)
Principal repayments on available-for-sale investment securities	[1]	63,568	33,202
Proceeds from sale of available-for-sale investment securities	[1]	0	79,564
Redemption of stock from Federal Home Loan Bank	[1]	58,623	11,683
Net increase in loans held for investment	[1]	(23,206)	(137,122)
Proceeds from sale of real estate acquired in settlement of loans	[1]	1,258	2,162
Capital expenditures	[1]	(206,816)	(173,866)
Contributions in aid of construction	[1]	19,089	13,209
Other	[1]	3,819	485
Net cash used in investing activities	[1]	(291,775)	(296,214)
Cash flows from financing activities
Net increase in deposit liabilities	[1]	179,856	152,383
Net increase in short-term borrowings with original maturities of three months or less	[1]	5,571	79,693
Net increase (decrease) in retail repurchase agreements	[1]	13,508	(2,053)
Proceeds from other bank borrowings	[1]	10,000	0
Proceeds from issuance of long-term debt	[1]	0	125,000
Repayment of long-term debt	[1]	0	(100,000)
Excess tax benefits from share-based payment arrangements	[1]	984	267
Net proceeds from issuance of common stock	[1]	104,469	3,048
Common stock dividends	[1]	(65,140)	(62,916)
Preferred stock dividends of subsidiaries	[1]	(946)	(946)
Other	[1]	246	(228)
Net cash provided by financing activities	[1]	248,548	194,248
Net increase (decrease) in cash and cash equivalents	[1]	125,145	(31,659)
Cash and cash equivalents, beginning of period	[1]	175,542	220,036
Cash and cash equivalents, end of period	[1]	$ 300,687	$ 188,377

[1] As restated - See Note 1, “Basis of presentation - Restatement of previously issued financial statements.”