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Shareholders' equity (Tables)
 9 Months Ended
Sep. 30, 2016
Equity [Abstract]  
Schedule of accumulated other comprehensive income
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 on derivatives
 
Retirement benefit plans
 
AOCI
Balance, December 31, 2015
$
(1,872
)
 
$
(54
)
 
$
(24,336
)
 
$
(26,262
)
 
$
—

 
$
925

 
$
925

Current period other comprehensive income
7,837

 
459

 
943

 
9,239

 
405

 
7

 
412

Balance, September 30, 2016
$
5,965

 
$
405

 
$
(23,393
)
 
$
(17,023
)
 
$
405

 
$
932

 
$
1,337

Balance, December 31, 2014
$
462

 
$
(289
)
 
$
(27,551
)
 
$
(27,378
)
 
$
—

 
$
45

 
$
45

Current period other comprehensive income
3,608

 
177

 
1,576

 
5,361

 
—

 
11

 
11

Balance, September 30, 2015
$
4,070

 
$
(112
)
 
$
(25,975
)
 
$
(22,017
)
 
$
—

 
$
56

 
$
56
Schedule of reclassifications out of accumulated other comprehensive income/(loss)
Reclassifications out of AOCI were as follows:
 
 
Amount reclassified from AOCI
 
 
 
 
Three months ended September 30
 
Nine months ended September 30
 
Affected line item in the
(in thousands)
 
2016
 
2015
 
2016
 
2015
 
 Statement of Income
HEI consolidated
 
 
 
 
 
 
 
 
 
 
Net realized gains on securities
 
$
—

 
$
—

 
$
(360
)
 
$
—

 
Revenues-bank (net gains on sales of securities)
Derivatives qualified as cash flow hedges
 
 

 
 

 
 

 
 

 
 
Window forward contracts
 
(173
)
 
—

 
(173
)
 
—

 
Revenues-electric utility (gains on window forward)
Interest rate contracts (settled in 2011)
 
—

 
59

 
54

 
177

 
Interest expense
Retirement benefit plan items
 
 

 
 

 
 

 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
3,641

 
5,611

 
10,877

 
16,850

 
See Note 6 for additional details
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets
 
(3,311
)
 
(5,091
)
 
(9,934
)
 
(15,274
)
 
See Note 6 for additional details
Total reclassifications
 
$
157

 
$
579

 
$
464

 
$
1,753

 
 
Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
Derivatives qualified as cash flow hedges
 
 
 
 
 
 
 
 
 
 
Window forward contracts
 
$
(173
)
 
$
—

 
$
(173
)
 
$
—

 
Revenues (gains on window forward)
Retirement benefit plan items
 
 
 
 

 
 
 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
3,314

 
5,095

 
9,941

 
15,285

 
See Note 6 for additional details
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets
 
(3,311
)
 
(5,091
)
 
(9,934
)
 
(15,274
)
 
See Note 6 for additional details
Total reclassifications
 
$
(170
)
 
$
4

 
$
(166
)
 
$
11