Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 192,555	$ 220,036
Accounts receivable and unbilled revenues, net	365,728	346,785
Available-for-sale investment and mortgage-related securities	531,603	529,007
Investment in stock of Federal Home Loan Bank of Seattle	75,063	92,546
Loans receivable held for investment, net	4,291,960	4,110,113
Loans held for sale, at lower of cost or fair value	2,328	5,302
Property, plant and equipment, net of accumulated depreciation of $2,224,728 and $2,192,422 at the respective dates	4,048,106	3,865,514
Regulatory assets	575,712	575,924
Other	505,226	512,627
Goodwill	82,190	82,190
Total assets	10,670,471	10,340,044
Liabilities
Accounts payable	177,495	212,331
Interest and dividends payable	26,051	26,716
Deposit liabilities	4,533,797	4,372,477
Short-term borrowings—other than bank	150,576	105,482
Other bank borrowings	263,204	244,514
Long-term debt, net—other than bank	1,517,946	1,492,945
Deferred income taxes	585,432	529,260
Regulatory liabilities	357,090	349,299
Contributions in aid of construction	448,811	432,894
Defined benefit pension and other postretirement benefit plans liability	274,909	288,539
Other	499,459	524,224
Total liabilities	8,834,770	8,578,681
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Commitments and contingencies (Notes 3 and 4)
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: 101,560,176 shares and 101,259,800 shares at the respective dates	1,519,256	1,488,126
Retained earnings	296,146	255,694
Accumulated other comprehensive loss, net of taxes	(13,994)	(16,750)
Common stock equity	1,801,408	1,727,070
Total liabilities and shareholders’ equity	$ 10,670,471	$ 10,340,044