Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 261,881	$ 278,452
Accounts receivable and unbilled revenues, net	263,209	237,950
Available-for-sale investment securities, at fair value	1,401,198	1,105,182
Held-to-maturity investment securities, at amortized cost	44,515	0
Stock in Federal Home Loan Bank, at cost	9,706	11,218
Loans receivable held for investment, net	4,617,131	4,683,160
Loans held for sale, at lower of cost or fair value	11,250	18,817
Property, plant and equipment, net
Land	106,435	97,423
Plant and equipment	7,140,427	6,727,935
Construction in progress	332,349	222,455
Property, plant and equipment, gross	7,579,211	7,047,813
Less – accumulated depreciation	(2,553,295)	(2,444,348)
Total property, plant and equipment, net	5,025,916	4,603,465
Regulatory assets	869,297	957,451
Other	513,535	447,621
Goodwill	82,190	82,190
Total assets	13,099,828	12,425,506
Liabilities
Accounts payable	193,714	143,279
Interest and dividends payable	25,837	25,225
Deposit liabilities	5,890,597	5,548,929
Short-term borrowings—other than bank	117,945	0
Other bank borrowings	190,859	192,618
Long-term debt, net—other than bank	1,683,797	1,619,019
Deferred income taxes	388,430	728,806
Regulatory liabilities	880,770	410,693
Contributions in aid of construction	565,668	543,525
Defined benefit pension and other postretirement benefit plans liability	509,514	638,854
Other	521,018	473,512
Total liabilities	10,968,149	10,324,460
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Commitments and contingencies
Shareholders' equity
Preferred stock, no par value, authorized 10,000,000 shares; issued: none	0	0
Common stock, no par value, authorized 200,000,000 shares; issued and outstanding: 108,787,807 shares and 108,583,413 shares at December 31, 2017 and 2016, respectively	1,662,491	1,660,910
Retained earnings	476,836	438,972
Accumulated other comprehensive loss, net of tax benefits
Net unrealized losses on securities	(14,951)	(7,931)
Unrealized losses on derivatives	0	(454)
Retirement benefit plans	(26,990)	(24,744)
Accumulated other comprehensive loss, net of tax benefits	(41,941)	(33,129)
Total shareholders’ equity	2,097,386	2,066,753
Total capitalization and liabilities	$ 13,099,828	$ 12,425,506