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Retirement benefits (Tables)
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Schedule of components of net periodic benefit cost for consolidated HEI
The components of net periodic benefit cost for consolidated HEI were as follows:
 
 
 
Three months ended September 30
 
Nine months ended September 30
 
 
Pension benefits
 
Other benefits
 
Pension benefits
 
Other benefits
(in thousands)
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
 
$
14,097

 
$
10,816

 
$
1,077

 
$
1,054

 
$
42,307

 
$
32,404

 
$
3,229

 
$
3,158

Interest cost
 
16,187

 
16,868

 
1,891

 
2,252

 
48,600

 
50,612

 
5,677

 
6,756

Expected return on plan assets
 
(18,134
)
 
(17,796
)
 
(2,531
)
 
(2,579
)
 
(54,401
)
 
(53,388
)
 
(7,614
)
 
(7,757
)
Amortization of net transition obligation
 
—

 
1

 
—

 
—

 
—

 
1

 
—

 
—

Amortization of net prior service gain
 
(24
)
 
(81
)
 
(448
)
 
(448
)
 
(73
)
 
(244
)
 
(1,345
)
 
(1,345
)
Amortization of net actuarial loss
 
9,560

 
6,425

 
398

 
373

 
28,878

 
19,251

 
1,203

 
1,125

Net periodic benefit cost
 
21,686

 
16,233

 
387

 
652

 
65,311

 
48,636

 
1,150

 
1,937

Impact of PUC D&Os
 
(9,257
)
 
(3,460
)
 
(332
)
 
(552
)
 
(28,847
)
 
(12,294
)
 
(1,018
)
 
(1,648
)
Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
12,429

 
$
12,773

 
$
55

 
$
100

 
$
36,464

 
$
36,342

 
$
132

 
$
289