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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities    
Net income $ 32,825 $ 32,339
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation of property, plant and equipment 48,594 45,865
Other amortization 1,928 2,371
Provision for loan losses 4,766 614
Loans receivable originated and purchased, held for sale (42,719) (79,070)
Proceeds from sale of loans receivable, held for sale 40,363 78,332
Increase in deferred income taxes 13,008 3,828
Share-based compensation expense 1,013 1,754
Excess tax benefits from share-based payment arrangements (380) (968)
Allowance for equity funds used during construction (1,739) (1,413)
Changes in assets and liabilities    
Decrease in accounts receivable and unbilled revenues, net 28,108 58,331
Decrease in fuel oil stock 22,812 20,731
Decrease (increase) in regulatory assets 1,585 (10,827)
Increase in accounts, interest and dividends payable 30,135 22,053
Change in prepaid and accrued income taxes and utility revenue taxes (14,343) (9,461)
Increase in defined benefit pension and other postretirement benefit plans liability 137 123
Change in other assets and liabilities 4,499 (25,992)
Net cash provided by operating activities 170,592 138,610
Cash flows from investing activities    
Available-for-sale investment securities purchased (122,387) (63,370)
Principal repayments on available-for-sale investment securities 48,819 28,486
Purchase of stock from Federal Home Loan Bank (1,373) 0
Redemption of stock from Federal Home Loan Bank 833 5,590
Net increase in loans held for investment (28,137) (12,524)
Proceeds from sale of real estate acquired in settlement of loans 232 606
Capital expenditures (127,818) (123,527)
Contributions in aid of construction 13,761 9,145
Other 819 3,549
Net cash used in investing activities (215,251) (152,045)
Cash flows from financing activities    
Net increase in deposit liabilities 114,678 127,913
Net decrease in short-term borrowings with original maturities of three months or less (7,578) (88,472)
Net increase in retail repurchase agreements 19,041 21,451
Proceeds from other bank borrowings 20,835 0
Repayments of other bank borrowings (39,369) 0
Proceeds from issuance of long-term debt 75,000 0
Repayment of long-term debt (75,000) 0
Excess tax benefits from share-based payment arrangements 380 968
Net proceeds from issuance of common stock 3,022 104,468
Common stock dividends (27,716) (31,829)
Preferred stock dividends of subsidiaries (473) (473)
Other (3,896) (3,965)
Net cash provided by financing activities 78,924 130,061
Net increase in cash and cash equivalents 34,265 116,626
Cash and cash equivalents, beginning of period 300,478 175,542
Cash and cash equivalents, end of period $ 334,743 $ 292,168