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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net income for common stock $ 127,142 $ 50,673 $ 203,622 $ 117,557
Net unrealized gains (losses) on available-for-sale investment securities:        
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of (taxes) benefits of $1,417, $(2,543), $(5,413) and $(2,382) for the respective periods (2,147) 3,851 8,197 3,608
Less: reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil, $238 and nil for the respective periods 0 0 (360) 0
Derivatives qualified as cash flow hedges:        
Effective portion of foreign currency hedge net unrealized gains, net of taxes of $205, nil, $368 and nil for the respective periods 321 0 578 0
Less: reclassification adjustment to net income, net of (taxes) benefits of $(110), $37, $(75) and $112 for the respective periods (173) 59 (119) 177
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,324, $3,583, $6,943 and $10,760 for the respective periods 3,641 5,611 10,877 16,850
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods (3,311) (5,091) (9,934) (15,274)
Other comprehensive income (loss), net of taxes (1,669) 4,430 9,239 5,361
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 125,473 $ 55,103 $ 212,861 $ 122,918