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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities      
Net income $ 250,146 $ 161,767 $ 170,019
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation of property, plant and equipment 194,273 183,966 172,762
Other amortization 10,473 11,619 10,282
Provision for loan losses 16,763 6,275 6,126
Impairment of utility assets 0 6,021 1,866
Loans receivable originated and purchased, held for sale (236,769) (268,279) (155,755)
Proceeds from sale of loans receivable, held for sale 236,062 275,296 155,030
Deferred income taxes 47,118 41,432 104,225
Share-based compensation expense 4,789 6,542 9,287
Excess tax benefits from share-based payment arrangements (404) (978) (277)
Allowance for equity funds used during construction (8,325) (6,928) (6,771)
Other (12,422) 1,672 (280)
Changes in assets and liabilities      
Decrease (increase) in accounts receivable and unbilled revenues, net (898) 62,304 33,089
Decrease in fuel oil stock 4,786 34,830 28,041
Increase in regulatory assets (18,273) (24,182) (17,000)
Decrease in accounts, interest and dividends payable (9,643) (52,663) (67,189)
Change in prepaid and accrued income taxes, tax credits and revenue taxes 39,109 (42,596) (39,091)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability 1,587 852 22,251
Change in other assets and liabilities (23,118) (41,070) (101,195)
Net cash provided by operating activities 495,254 355,880 325,420
Cash flows from investing activities      
Available-for-sale investment securities purchased (533,956) (429,262) (183,778)
Principal repayments on available-for-sale investment securities 219,845 153,271 91,013
Proceeds from sale of available-for-sale investment securities 16,423 0 79,564
Purchase of stock from Federal Home Loan Bank (7,773) (1,600) 0
Redemption of stock from Federal Home Loan Bank 7,233 60,223 23,244
Net increase in loans held for investment (194,042) (181,343) (283,810)
Proceeds from sale of commercial loans 52,299 0 0
Proceeds from sale of real estate acquired in settlement of loans 829 1,329 3,213
Proceeds from sale of real estate held for sale 1,764 7,283 0
Capital expenditures (330,043) (363,804) (364,826)
Contributions in aid of construction 30,100 40,239 41,806
Other 856 7,940 1,125
Net cash used in investing activities (736,465) (705,724) (592,449)
Cash flows from financing activities      
Net increase in deposit liabilities 523,675 401,839 250,938
Net increase (decrease) in short-term borrowings with original maturities of three months or less (103,063) (15,909) 13,490
Net increase (decrease) in retail repurchase agreements (43,601) 37,925 (9,465)
Proceeds from other bank borrowings 180,835 50,000 130,601
Repayments of other bank borrowings (272,902) (50,000) (75,000)
Proceeds from issuance of long-term debt 115,000 80,000 125,000
Repayment of long-term debt (75,000) 0 (111,400)
Excess tax benefits from share-based payment arrangements 404 978 277
Net proceeds from issuance of common stock 13,220 104,435 26,898
Common stock dividends (117,274) (131,765) (126,458)
Preferred stock dividends of subsidiaries (1,890) (1,890) (1,890)
Other (219) (833) (456)
Net cash used in financing activities 219,185 474,780 222,535
Net increase (decrease) in cash and equivalents (22,026) 124,936 (44,494)
Cash and cash equivalents, January 1 300,478 175,542 220,036
Cash and cash equivalents, December 31 $ 278,452 $ 300,478 $ 175,542