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	$ 67,830	$ 88,014
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	91,731	86,397
Other amortization	4,320	4,014
Provision for loan losses	2,439	2,016
Loans receivable originated and purchased, held for sale	(168,921)	(69,656)
Proceeds from sale of loans receivable, held for sale	173,267	75,040
Increase in deferred income taxes	22,980	28,570
Excess tax benefits from share-based payment arrangements	(984)	(267)
Allowance for equity funds used during construction	(3,309)	(2,996)
Change in cash overdraft	193	(1,038)
Changes in assets and liabilities
Decrease (increase) in accounts receivable and unbilled revenues, net	44,489	(2,986)
Increase in fuel oil stock	(2,362)	(27,206)
Increase in regulatory assets	(19,976)	(17,731)
Decrease in accounts, interest and dividends payable	(56,076)	(64,843)
Change in prepaid and accrued income taxes and utility revenue taxes	(4,390)	(32,510)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability	218	(1,714)
Change in other assets and liabilities	(47,146)	(16,909)
Net cash provided by operating activities	104,303	46,195
Cash flows from investing activities
Available-for-sale investment securities purchased	(208,110)	(125,531)
Principal repayments on available-for-sale investment securities	63,568	33,202
Proceeds from sale of available-for-sale investment securities	0	79,564
Redemption of stock from Federal Home Loan Bank	58,623	11,683
Net increase in loans held for investment	(23,206)	(137,122)
Proceeds from sale of real estate acquired in settlement of loans	1,258	2,162
Capital expenditures	(142,236)	(149,253)
Contributions in aid of construction	19,089	13,209
Other	3,308	(16)
Net cash used in investing activities	(227,706)	(272,102)
Cash flows from financing activities
Net increase in deposit liabilities	179,856	152,383
Net increase in short-term borrowings with original maturities of three months or less	5,571	79,693
Net increase (decrease) in retail repurchase agreements	13,508	(2,053)
Proceeds from other bank borrowings	10,000	0
Proceeds from issuance of long-term debt	0	125,000
Repayment of long-term debt	0	(100,000)
Excess tax benefits from share-based payment arrangements	984	267
Net proceeds from issuance of common stock	104,469	3,048
Common stock dividends	(65,140)	(62,916)
Preferred stock dividends of subsidiaries	(946)	(946)
Other	246	(228)
Net cash provided by financing activities	248,548	194,248
Net increase (decrease) in cash and cash equivalents	125,145	(31,659)
Cash and cash equivalents, beginning of period	175,542	220,036
Cash and cash equivalents, end of period	$ 300,687	$ 188,377