Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income	[1]	$ 32,339	$ 46,260
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	[1]	45,865	43,181
Other amortization	[1]	2,371	1,609
Provision for loan losses	[1]	614	995
Loans receivable originated and purchased, held for sale	[1]	(79,070)	(46,998)
Proceeds from sale of loans receivable, held for sale	[1]	78,332	48,720
Increase in deferred income taxes	[1]	3,828	6,457
Share-based compensation expense	[1]	1,754	2,361
Excess tax benefits from share-based payment arrangements	[1]	(968)	(164)
Allowance for equity funds used during construction	[1]	(1,413)	(1,609)
Change in cash overdraft	[1]	0	(1,038)
Changes in assets and liabilities
Decrease in accounts receivable and unbilled revenues, net	[1]	58,331	22,352
Decrease (increase) in fuel oil stock	[1]	20,731	(34,260)
Increase in regulatory assets	[1]	(10,827)	(9,258)
Increase in accounts, interest and dividends payable	[1]	22,053	15,306
Change in prepaid and accrued income taxes and utility revenue taxes	[1]	(9,461)	(19,474)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability	[1]	123	(818)
Change in other assets and liabilities	[1]	(25,992)	(29,931)
Net cash provided by operating activities	[1]	138,610	43,691
Cash flows from investing activities
Available-for-sale investment securities purchased	[1]	(63,370)	(79,912)
Principal repayments on available-for-sale investment securities	[1]	28,486	15,597
Proceeds from sale of available-for-sale investment securities	[1]	0	79,564
Redemption of stock from Federal Home Loan Bank	[1]	5,590	5,848
Net increase in loans held for investment	[1]	(12,524)	(37,887)
Proceeds from sale of real estate acquired in settlement of loans	[1]	606	1,429
Capital expenditures	[1]	(123,527)	(90,442)
Contributions in aid of construction	[1]	9,145	6,958
Other	[1]	3,549	343
Net cash used in investing activities	[1]	(152,045)	(98,502)
Cash flows from financing activities
Net increase in deposit liabilities	[1]	127,913	105,510
Net increase (decrease) in short-term borrowings with original maturities of three months or less	[1]	(88,472)	30,887
Net increase in retail repurchase agreements	[1]	21,451	141
Excess tax benefits from share-based payment arrangements	[1]	968	164
Net proceeds from issuance of common stock	[1]	104,468	3,054
Common stock dividends	[1]	(31,829)	(31,435)
Preferred stock dividends of subsidiaries	[1]	(473)	(473)
Other	[1]	(3,965)	(3,953)
Net cash provided by financing activities	[1]	130,061	103,895
Net increase in cash and cash equivalents	[1]	116,626	49,084
Cash and cash equivalents, beginning of period	[1]	175,542	220,036
Cash and cash equivalents, end of period	[1]	$ 292,168	$ 269,120

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