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Shareholders' equity
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Shareholders' equity
Shareholders’ equity
Accumulated other comprehensive income/(loss).  Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows:
 
HEI Consolidated
 
Hawaiian Electric Consolidated
 (in thousands)
 Net unrealized gains (losses) on securities
 
 Unrealized gains (losses) on derivatives
 
Retirement benefit plans
 
AOCI
 
Unrealized gains (losses) on derivatives
 
Retirement benefit plans
 
AOCI
Balance, December 31, 2017
$
(14,951
)
 
$
—

 
$
(26,990
)
 
$
(41,941
)
 
$
—

 
$
(1,219
)
 
$
(1,219
)
Current period other comprehensive income (loss)
(13,297
)
 
—

 
524

 
(12,773
)
 
—

 
31

 
31

Balance, March 31, 2018
$
(28,248
)
 
$
—

 
$
(26,466
)
 
$
(54,714
)
 
$
—

 
$
(1,188
)
 
$
(1,188
)
Balance, December 31, 2016
$
(7,931
)
 
$
(454
)
 
$
(24,744
)
 
$
(33,129
)
 
$
(454
)
 
$
132

 
$
(322
)
Current period other comprehensive income
223

 
454

 
308

 
985

 
454

 
5

 
459

Balance, March 31, 2017
$
(7,708
)
 
$
—

 
$
(24,436
)
 
$
(32,144
)
 
$
—

 
$
137

 
$
137


Reclassifications out of AOCI were as follows:
 
 
Amount reclassified from AOCI
 
 
 
 
Three months ended March 31
 
Affected line item in the
(in thousands)
 
2018
 
2017
 
 Statements of Income / Balance Sheets
HEI consolidated
 
 
 
 
 
 
Derivatives qualifying as cash flow hedges:
 
 

 
 

 
 
Window forward contracts
 
$
—

 
$
454

 
Property, plant and equipment-electric utilities
Retirement benefit plans:
 
 

 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
5,146

 
3,921

 
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(4,622
)
 
(3,613
)
 
See Note 8 for additional details
Total reclassifications
 
$
524

 
$
762

 
 
Hawaiian Electric consolidated
 
 
 
 
 
 
Derivatives qualifying as cash flow hedges:
 
 
 
 
 
 
Window forward contracts
 
$
—

 
$
454

 
Property, plant and equipment
Retirement benefit plans:
 
 
 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
4,653

 
3,618

 
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(4,622
)
 
(3,613
)
 
See Note 8 for additional details
Total reclassifications
 
$
31

 
$
459