Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 300,478	$ 175,542
Accounts receivable and unbilled revenues, net	242,766	313,696
Available-for-sale investment securities	820,648	550,394
Stock in Federal Home Loan Bank, at cost	10,678	69,302
Loans receivable held for investment, net	4,565,781	4,389,033
Loans held for sale, at lower of cost or fair value	4,631	8,424
Property, plant and equipment, net
Land	90,890	94,093
Plant and equipment	6,444,214	6,137,417
Construction in progress	181,873	168,214
Property, plant and equipment, gross	6,716,977	6,399,724
Less – accumulated depreciation	(2,339,319)	(2,250,950)
Total property, plant and equipment, net	4,377,658	4,148,774
Regulatory assets	896,731	905,264
Other	488,635	542,523
Goodwill	82,190	82,190
Total assets	11,790,196	11,185,142
Liabilities
Accounts payable	138,523	186,425
Interest and dividends payable	26,042	25,336
Deposit liabilities	5,025,254	4,623,415
Short-term borrowings—other than bank	103,063	118,972
Other bank borrowings	328,582	290,656
Long-term debt, net—other than bank	1,586,546	1,506,546
Deferred income taxes	680,877	633,570
Regulatory liabilities	371,543	344,849
Contributions in aid of construction	506,087	466,432
Defined benefit pension and other postretirement benefit plans liability	589,918	632,845
Other	471,828	531,230
Total liabilities	9,828,263	9,360,276
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: 107,460,406 shares and 102,565,266 shares at December 31, 2015 and 2014, respectively	1,629,136	1,521,297
Retained earnings	324,766	296,654
Accumulated other comprehensive income (loss), net of taxes
Net unrealized gains (losses) on securities	(1,872)	462
Unrealized losses on derivatives	(54)	(289)
Retirement benefit plans	(24,336)	(27,551)
Accumulated other comprehensive income (loss), net of taxes	(26,262)	(27,378)
Total shareholders’ equity	1,927,640	1,790,573
Total capitalization and liabilities	$ 11,790,196	$ 11,185,142