Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 234,230	$ 278,452
Accounts receivable and unbilled revenues, net	252,416	237,950
Available-for-sale investment securities, at fair value	1,228,922	1,105,182
Stock in Federal Home Loan Bank, at cost	11,706	11,218
Loans receivable held for investment, net	4,669,274	4,683,160
Loans held for sale, at lower of cost or fair value	10,454	18,817
Property, plant and equipment, net of accumulated depreciation of $2,475,562 and $2,444,348 at March 31, 2017 and December 31, 2016, respectively	4,641,514	4,603,465
Regulatory assets	945,409	957,451
Other	467,160	447,621
Goodwill	82,190	82,190
Total assets	12,543,275	12,425,506
Liabilities
Accounts payable	160,819	143,279
Interest and dividends payable	27,407	25,225
Deposit liabilities	5,675,090	5,548,929
Short-term borrowings—other than bank	2,300	0
Other bank borrowings	200,154	192,618
Long-term debt, net—other than bank	1,618,651	1,619,019
Deferred income taxes	740,506	728,806
Regulatory liabilities	419,940	410,693
Contributions in aid of construction	541,574	543,525
Defined benefit pension and other postretirement benefit plans liability	632,964	638,854
Other	423,989	473,512
Total liabilities	10,443,394	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: 108,745,265 shares and 108,583,413 shares at March 31, 2017 and December 31, 2016, respectively	1,658,280	1,660,910
Retained earnings	439,452	438,972
Accumulated other comprehensive loss, net of tax benefits	(32,144)	(33,129)
Total shareholders’ equity	2,065,588	2,066,753
Total liabilities and shareholders’ equity	$ 12,543,275	$ 12,425,506