Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income	$ 118,974	$ 136,293
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	137,721	129,574
Other amortization	12,080	5,081
Provision for loan losses	5,436	3,566
Loans receivable originated and purchased, held for sale	(226,081)	(102,523)
Proceeds from sale of loans receivable, held for sale	231,509	106,918
Increase in deferred income taxes	2,723	50,296
Share-based compensation expense	4,780	7,200
Excess tax benefits from share-based payment arrangements	(1,012)	(271)
Allowance for equity funds used during construction	(5,366)	(4,933)
Change in cash overdraft	0	(1,038)
Changes in assets and liabilities
Decrease (increase) in accounts receivable and unbilled revenues, net	8,248	(18,943)
Decrease in fuel oil stock	35,942	15,784
Increase in regulatory assets	(23,458)	(17,531)
Decrease in accounts, interest and dividends payable	(34,171)	(51,199)
Change in prepaid and accrued income taxes and utility revenue taxes	(8,458)	(2,044)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability	418	(2,594)
Change in other assets and liabilities	(38,033)	(56,326)
Net cash provided by operating activities	221,252	197,310
Cash flows from investing activities
Available-for-sale investment securities purchased	(326,965)	(130,578)
Principal repayments on available-for-sale investment securities	96,053	52,678
Proceeds from sale of available-for-sale investment securities	0	79,564
Purchase of stock from Federal Home Loan Bank	(1,600)	0
Redemption of stock from Federal Home Loan Bank	60,223	17,482
Net increase in loans held for investment	(101,771)	(184,766)
Proceeds from sale of real estate acquired in settlement of loans	1,258	2,930
Proceeds from sale of real estate held-for-sale	7,280	0
Capital expenditures	(276,186)	(260,616)
Contributions in aid of construction	34,627	21,740
Other	4,084	674
Net cash used in investing activities	(502,997)	(400,892)
Cash flows from financing activities
Net increase in deposit liabilities	202,539	161,320
Net increase in short-term borrowings with original maturities of three months or less	53,020	45,094
Net increase (decrease) in retail repurchase agreements	67,934	(6,306)
Proceeds from other bank borrowings	50,000	90,000
Repayments of other bank borrowings	(40,000)	(65,000)
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	1,012	271
Net proceeds from issuance of common stock	104,437	26,910
Common stock dividends	(98,452)	(94,674)
Preferred stock dividends of subsidiaries	(1,417)	(1,417)
Other	(4,453)	(5,097)
Net cash provided by financing activities	334,620	176,101
Net increase (decrease) in cash and cash equivalents	52,875	(27,481)
Cash and cash equivalents, beginning of period	175,542	220,036
Cash and cash equivalents, end of period	$ 228,417	$ 192,555