Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 283,483	$ 330,651
Accounts receivable and unbilled revenues, net	342,901	266,996
Available-for-sale investment and mortgage-related securities	571,045	678,152
Investment in stock of Federal Home Loan Bank of Seattle	97,764	97,764
Loans receivable held for investment, net	3,622,181	3,489,880
Loans held for sale, at lower of cost or fair value	25,016	7,849
Property, plant and equipment, net of accumulated depreciation of $2,033,576 in 2011 and $2,037,598 in 2010	3,248,658	3,165,918
Regulatory assets	494,487	478,330
Other	496,638	487,614
Goodwill	82,190	82,190
Total assets	9,264,363	9,085,344
Liabilities
Accounts payable	165,909	202,446
Interest and dividends payable	28,010	27,814
Deposit liabilities	4,062,801	3,975,372
Short-term borrowings-other than bank	51,195	24,923
Other bank borrowings	237,934	237,319
Long-term debt, net-other than bank	1,340,038	1,364,942
Deferred income taxes	342,232	278,958
Regulatory liabilities	313,299	296,797
Contributions in aid of construction	344,110	335,364
Other	806,784	823,479
Total liabilities	7,692,312	7,567,414
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Commitments and contingencies (Note 9)
Shareholders' equity
Preferred stock, no par value, authorized 10,000,000 shares; issued: none
Common stock, no par value, authorized 200,000,000 shares; issued and outstanding: 95,975,524 shares in 2011 and 94,690,932 shares in 2010	1,347,255	1,314,199
Retained earnings	197,165	181,910
Accumulated other comprehensive loss, net of tax benefits	(6,662)	(12,472)
Total shareholders' equity	1,537,758	1,483,637
Total liabilities and shareholders' equity	$ 9,264,363	$ 9,085,344