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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net income $ 167,187 $ 250,146 $ 161,767
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation of property, plant and equipment 200,658 194,273 183,966
Other amortization 21,340 10,473 11,619
Provision for loan losses 10,901 16,763 6,275
Impairment of utility assets 0 0 6,021
Loans receivable originated and purchased, held for sale (115,104) (236,769) (268,279)
Proceeds from sale of loans receivable, held for sale 127,951 236,062 275,296
Deferred income taxes 37,835 47,118 41,432
Share-based compensation expense 5,404 4,789 6,542
Allowance for equity funds used during construction (12,483) (8,325) (6,928)
Other (3,324) (12,422) 1,672
Changes in assets and liabilities      
Decrease (increase) in accounts receivable and unbilled revenues, net (12,875) (898) 62,304
Decrease (increase) in fuel oil stock (20,794) 4,786 34,830
Increase in regulatory assets (17,256) (18,273) (24,182)
Increase (decrease) in accounts, interest and dividends payable 34,985 (9,643) (52,663)
Change in prepaid and accrued income taxes, tax credits and utility revenue taxes 20,685 39,109 (42,596)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability 882 1,587 852
Change in other assets and liabilities (25,551) (23,118) (41,070)
Net cash provided by operating activities 420,441 495,658 356,858
Cash flows from investing activities      
Available-for-sale investment securities purchased (528,379) (533,956) (429,262)
Principal repayments on available-for-sale investment securities 220,231 219,845 153,271
Proceeds from sale of available-for-sale investment securities 0 16,423 0
Purchases of held-to-maturity investment securities (44,515) 0 0
Purchase of stock from Federal Home Loan Bank (2,868) (7,773) (1,600)
Redemption of stock from Federal Home Loan Bank 4,380 7,233 60,223
Net decrease (increase) in loans held for investment 15,887 (194,042) (181,343)
Proceeds from sale of commercial loans 36,760 52,299 0
Proceeds from sale of real estate acquired in settlement of loans 1,019 829 1,329
Proceeds from sale of real estate held for sale 0 1,764 7,283
Capital expenditures (495,187) (330,043) (363,804)
Contributions in aid of construction 64,733 30,100 40,239
Contributions to low income housing investments (17,505) 0 0
Acquisition of business (76,323) 0 0
Other 6,468 856 7,940
Net cash used in investing activities (815,299) (736,465) (705,724)
Cash flows from financing activities      
Net increase in deposit liabilities 341,668 523,675 401,839
Net increase (decrease) in short-term borrowings with original maturities of three months or less 67,992 (103,063) (15,909)
Proceeds from issuance of short-term debt 125,000 0 0
Repayment of short-term debt (75,000) 0 0
Net increase (decrease) in retail repurchase agreements 61,776 (43,601) 37,925
Proceeds from other bank borrowings 59,500 180,835 50,000
Repayments of other bank borrowings (123,034) (272,902) (50,000)
Proceeds from issuance of long-term debt 532,325 115,000 80,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds (465,000) (75,000) 0
Withheld shares for employee taxes on vested share-based compensation (3,828) (2,416) (3,260)
Net proceeds from issuance of common stock 0 13,220 104,435
Common stock dividends (134,873) (117,274) (131,765)
Preferred stock dividends of subsidiaries (1,890) (1,890) (1,890)
Other (6,349) 2,197 2,427
Net cash used in financing activities 378,287 218,781 473,802
Net increase (decrease) in cash and equivalents (16,571) (22,026) 124,936
Cash and cash equivalents, January 1 278,452 300,478 175,542
Cash and cash equivalents, December 31 $ 261,881 $ 278,452 $ 300,478