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Shareholders' equity
6 Months Ended
Jun. 30, 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)
(17,645
)
 

 
1,047

 
(16,598
)
 

 
57

 
57

Balance, June 30, 2018
$
(32,596
)
 
$

 
$
(25,943
)
 
$
(58,539
)
 
$

 
$
(1,162
)
 
$
(1,162
)
Balance, December 31, 2016
$
(7,931
)
 
$
(454
)
 
$
(24,744
)
 
$
(33,129
)
 
$
(454
)
 
$
132

 
$
(322
)
Current period other comprehensive income
2,244

 
454

 
657

 
3,355

 
454

 
45

 
499

Balance, June 30, 2017
$
(5,687
)
 
$

 
$
(24,087
)
 
$
(29,774
)
 
$

 
$
177

 
$
177


Reclassifications out of AOCI were as follows:
 
 
Amount reclassified from AOCI
 
 
 
 
Three months ended June 30
 
Six months ended June 30
 
Affected line item in the
(in thousands)
 
2018
 
2017
 
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
 
5,350

 
3,930

 
10,496

 
7,851

 
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(4,827
)
 
(3,581
)
 
(9,449
)
 
(7,194
)
 
See Note 8 for additional details
Total reclassifications
 
$
523

 
$
349

 
$
1,047

 
$
1,111

 
 
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
 
4,853

 
3,621

 
9,506

 
7,239

 
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(4,827
)
 
(3,581
)
 
(9,449
)
 
(7,194
)
 
See Note 8 for additional details
Total reclassifications
 
$
26

 
$
40

 
$
57

 
$
499