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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reclassifications out of accumulated other comprehensive income/(loss)    
Interest expense $ 20,126 $ 19,100
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,257 and $3,486 for the respective periods 3,538 5,459
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods (3,222) (4,911)
Hawaiian Electric Company, Inc. and Subsidiaries    
Reclassifications out of accumulated other comprehensive income/(loss)    
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,257 and $3,486 for the respective periods 3,236 4,933
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods (3,222) (4,911)
Amount reclassified from AOCI    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications 369 607
Amount reclassified from AOCI | Derivatives qualified as cash flow hedges Interest rate contracts (settled in 2011) | Interest rate contracts    
Reclassifications out of accumulated other comprehensive income/(loss)    
Interest expense 54 59
Amount reclassified from AOCI | Retirement benefit plans    
Reclassifications out of accumulated other comprehensive income/(loss)    
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,257 and $3,486 for the respective periods 3,537 5,459
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods (3,222) (4,911)
Amount reclassified from AOCI | Hawaiian Electric Company, Inc. and Subsidiaries    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications 14 22
Amount reclassified from AOCI | Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans    
Reclassifications out of accumulated other comprehensive income/(loss)    
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,257 and $3,486 for the respective periods 3,236 4,933
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods $ (3,222) $ (4,911)