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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities:      
Net income $ 115,932 $ 137,316 $ 123,317
Non-cash items included in net income:      
Depreciation and amortization 175,655 164,925 147,835
Provision for deferred income taxes 69,657 124,543 51,801
Power and natural gas cost amortizations (deferrals), net 11,741 16,835 21,358
Amortization of debt expense 3,254 3,477 3,526
Amortization of investment in exchange power 2,450 2,450 2,450
Stock-based compensation expense 7,359 7,891 6,914
Equity-related AFUDC (6,669) (8,475) (8,331)
Pension and other postretirement benefit expense 37,074 38,786 37,050
Amortization of Spokane Energy contract 0 14,694 13,508
Gain on sale of Ecova 0 0 (777)
Other regulatory assets and liabilities and deferred debits and credits (9,144) (26,245) 4,569
Change in decoupling regulatory deferral 24,179 (29,789) (10,933)
Other 1,860 5,557 (517)
Contributions to defined benefit pension plan (22,000) (12,000) (12,000)
Cash paid on settlement of interest rate swap derivatives (11,302) (53,966) 0
Cash received on settlement of interest rate swap derivatives 2,479 0 0
Changes in certain current assets and liabilities:      
Accounts and notes receivable (9,270) (17,170) (10,538)
Materials and supplies, fuel stock and stored natural gas (4,767) 834 12,208
Collateral posted for derivative instruments (22,394) 10,712 (13,301)
Income taxes receivable 53,414 (33,923) 19,772
Other current assets (2,106) (3,907) 2,338
Accounts payable (8,162) 5,176 (8,138)
Other current liabilities 1,058 10,546 (6,471)
Net cash provided by operating activities 410,298 358,267 375,640
Investing Activities:      
Utility property capital expenditures (excluding equity-related AFUDC) (412,339) (406,644) (393,425)
Issuance of notes receivable at subsidiaries (3,700) (10,094) (2,307)
Repayments from notes receivable at subsidiaries 0 5,000 0
Equity and property investments made by subsidiaries (13,680) (13,097) (1,944)
Distributions received from investments 1,915 0 0
Proceeds from sale of Ecova, net of cash sold 0 0 13,856
Other (6,299) (7,631) (4,007)
Net cash used in investing activities (434,103) (432,466) (387,827)
Financing Activities:      
Net increase (decrease) in short-term borrowings (15,000) 15,000 0
Proceeds from issuance of long-term debt 90,000 245,000 100,000
Redemption and maturity of long-term debt and capital leases (3,287) (163,167) (2,905)
Maturity of nonrecourse long-term debt of Spokane Energy 0 0 (1,431)
Issuance of common stock, net of issuance costs 56,380 66,953 1,560
Repurchase of common stock 0 0 (2,920)
Cash dividends paid (92,460) (87,154) (82,397)
Other (4,163) (4,410) (11,379)
Net cash provided by financing activities 31,470 72,222 528
Net increase (decrease) in cash and cash equivalents 7,665 (1,977) (11,659)
Cash and cash equivalents at beginning of year 8,507 10,484 22,143
Cash and cash equivalents at end of year 16,172 8,507 10,484
Cash paid (received) during the year:      
Interest 95,499 86,319 79,673
Income taxes paid 5,579 5,403 27,239
Income tax refunds (47,086) (18,861) (37,200)
Non-cash financing and investing activities:      
Accounts payable for capital expenditures $ 31,157 $ 30,252 $ 35,248