Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 188,377	$ 220,036
Accounts receivable and unbilled revenues, net	349,771	346,785
Available-for-sale investment and mortgage-related securities	549,321	529,007
Investment in stock of Federal Home Loan Bank of Seattle	80,863	92,546
Loans receivable held for investment, net	4,245,240	4,110,113
Loans held for sale, at lower of cost or fair value	956	5,302
Property, plant and equipment, net of accumulated depreciation of $2,224,728 and $2,192,422 at the respective dates	3,980,096	3,865,514
Regulatory assets	582,645	575,924
Other	557,684	512,627
Goodwill	82,190	82,190
Total assets	10,617,143	10,340,044
Liabilities
Accounts payable	176,379	212,331
Interest and dividends payable	25,315	26,716
Deposit liabilities	4,524,860	4,372,477
Short-term borrowings—other than bank	185,175	105,482
Other bank borrowings	242,455	244,514
Long-term debt, net—other than bank	1,517,945	1,492,945
Deferred income taxes	579,222	529,260
Regulatory liabilities	354,980	349,299
Contributions in aid of construction	442,379	432,894
Defined benefit pension and other postretirement benefit plans liability	278,427	288,539
Other	494,834	524,224
Total liabilities	8,821,971	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	1,493,436	1,488,126
Retained earnings	280,126	255,694
Accumulated other comprehensive loss, net of taxes	(12,683)	(16,750)
Common stock equity	1,760,879	1,727,070
Total liabilities and shareholders’ equity	$ 10,617,143	$ 10,340,044