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Consolidated Statements Of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Income (Loss) from Continuing Operations Attributable to Parent $ 115,916 $ 137,228 $ 118,080
Operating Revenues:      
Utility revenues 1,423,386 1,418,914 1,456,091
Non-utility revenues 22,543 23,569 28,685
Total operating revenues 1,445,929 1,442,483 1,484,776
Utility operating expenses:      
Resource costs 524,566 551,366 656,964
Other operating expenses 317,813 315,795 303,221
Acquisition costs 14,618 0 0
Depreciation and amortization 171,281 160,514 143,499
Taxes other than income taxes 106,752 98,735 97,657
Non-utility operating expenses:      
Other operating expenses 25,650 25,501 29,526
Depreciation, Depletion and Amortization, Nonproduction 740 769 695
Total operating expenses 1,161,420 1,152,680 1,231,562
Income from operations 284,509 289,803 253,214
Interest expense 95,361 86,496 79,968
Interest expense to affiliated trusts 831 634 473
Public Utilities, Allowance for Funds Used During Construction, Additions (3,310) (2,651) (3,546)
Other income-net (7,063) (10,078) (9,300)
Income from continuing operations before income taxes 198,690 215,402 185,619
Income tax expense 82,758 78,086 67,449
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 115,932 137,316 118,170
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 0 0 5,147
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 0 0 5,147
Net income from continuing operations 115,932 137,316 123,317
Net income attributable to noncontrolling interests (16) (88) (90)
Net income attributable to Avista Corp. shareholders $ 115,916 $ 137,228 $ 123,227
Weighted-average common shares outstanding (thousands), basic 64,496 63,508 62,301
Weighted-average common shares outstanding (thousands), diluted 64,806 63,920 62,708
Income (Loss) from Continuing Operations, Per Basic Share $ 1.80 $ 2.16 $ 1.90
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share 0.00 0.00 0.08
Earnings per common share attributable to Avista Corporation shareholders:      
Earnings Per Share, Basic 1.80 2.16 1.98
Earnings Per Share, Diluted 1.79 2.15 1.97
Income (Loss) from Continuing Operations, Per Diluted Share 1.79 2.15 1.89
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share 0.00 0.00 0.08
Dividends declared per common share $ 1.43 $ 1.37 $ 1.32