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Retirement benefits Components of NPBC (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Pension benefits |  |  |
Defined benefit plans |  |  |
Service cost | $ 49,264 | $ 56,405 | $ 43,221
Interest cost | 72,202 | 64,788 | 67,480
Expected return on plan assets | (81,355) | (72,537) | (71,183)
Amortization of net transition obligation | 0 | 0 | 1
Amortization of net prior service (gain) cost | 88 | (97) | (325)
Amortization of net actuarial loss (gain) | 20,304 | 38,438 | 25,675
Net periodic benefit cost | 60,503 | 86,997 | 64,869
Impact of PUC D&Os | (13,324) | (38,104) | (15,754)
Net periodic benefit cost (adjusted for impact of PUC D&Os) | 47,179 | 48,893 | 49,115
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015 |  |  |
Prior service credit | 0 |  |
Net actuarial loss | 35,800 |  |
Net transition obligation | 0 |  |
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined benefit plans |  |  |
Service cost | 47,597 | 54,482 | 41,603
Interest cost | 65,979 | 59,119 | 61,453
Expected return on plan assets | (72,661) | (64,551) | (64,004)
Amortization of net prior service (gain) cost | 62 | (464) | (689)
Amortization of net actuarial loss (gain) | 18,459 | 34,597 | 23,428
Net periodic benefit cost | 59,436 | 83,183 | 61,791
Impact of PUC D&Os | (13,324) | (38,104) | (15,754)
Net periodic benefit cost (adjusted for impact of PUC D&Os) | 46,112 | 45,079 | 46,037
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015 |  |  |
Prior service credit | 0 |  |
Net actuarial loss | 32,400 |  |
Net transition obligation | 0 |  |
Other benefits |  |  |
Defined benefit plans |  |  |
Service cost | 3,490 | 4,306 | 4,211
Interest cost | 8,550 | 7,569 | 9,009
Expected return on plan assets | (10,902) | (10,147) | (10,336)
Amortization of net prior service (gain) cost | (1,793) | (1,793) | (1,793)
Amortization of net actuarial loss (gain) | (11) | 1,602 | 1,498
Net periodic benefit cost | (666) | 1,537 | 2,589
Impact of PUC D&Os | 1,976 | (1,458) | (2,227)
Net periodic benefit cost (adjusted for impact of PUC D&Os) | 1,310 | 79 | 362
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015 |  |  |
Prior service credit | (1,800) |  |
Net actuarial loss | 1,700 |  |
Net transition obligation | 0 |  |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined benefit plans |  |  |
Service cost | 3,392 | 4,163 | 4,014
Interest cost | 8,234 | 7,288 | 8,703
Expected return on plan assets | (10,739) | (10,002) | (10,195)
Amortization of net transition obligation | 0 | 0 | (9)
Amortization of net prior service (gain) cost | (1,804) | (1,803) | (1,803)
Amortization of net actuarial loss (gain) | 0 | 1,544 | 1,455
Net periodic benefit cost | (917) | 1,190 | 2,165
Impact of PUC D&Os | 1,976 | (1,458) | (2,227)
Net periodic benefit cost (adjusted for impact of PUC D&Os) | 1,059 | $ (268) | $ (62)
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015 |  |  |
Prior service credit | (1,800) |  |
Net actuarial loss | 1,700 |  |
Net transition obligation | $ 0 |  |

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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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