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Retirement benefits - Components of NPBC (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension benefits |  |  |
Defined benefit plans |  |  |
Service cost | $ 68,987 | $ 64,906 | $ 60,555
Interest cost | 77,374 | 81,185 | 81,549
Expected return on plan assets | (108,953) | (102,745) | (98,559)
Amortization of net prior service (gain) cost | (42) | (55) | (57)
Amortization of net actuarial losses | 30,084 | 26,496 | 24,832
Net periodic pension/benefit cost | 67,450 | 69,787 | 68,320
Impact of PUC D&Os | 25,828 | (18,004) | (18,117)
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 93,278 | 51,783 | 50,203
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015 |  |  |
Prior service credit | 0 |  |
Net actuarial loss | 15,400 |  |
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined benefit plans |  |  |
Service cost | 67,359 | 63,059 | 58,796
Interest cost | 71,294 | 74,632 | 74,808
Expected return on plan assets | (102,368) | (95,892) | (91,633)
Amortization of net prior service (gain) cost | 8 | 8 | 13
Amortization of net actuarial losses | 27,302 | 24,392 | 22,693
Net periodic pension/benefit cost | 63,595 | 66,199 | 64,677
Impact of PUC D&Os | 25,828 | (18,004) | (18,117)
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | 89,423 | 48,195 | 46,560
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015 |  |  |
Prior service credit | 0 |  |
Net actuarial loss | 14,300 |  |
Other benefits |  |  |
Defined benefit plans |  |  |
Service cost | 2,721 | 3,374 | 3,331
Interest cost | 7,933 | 9,453 | 9,670
Expected return on plan assets | (12,908) | (12,326) | (12,273)
Amortization of net prior service (gain) cost | (1,805) | (1,793) | (1,793)
Amortization of net actuarial losses | 95 | 1,130 | 804
Net periodic pension/benefit cost | (3,964) | (162) | (261)
Impact of PUC D&Os | 3,842 | 1,211 | 1,343
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (122) | 1,049 | 1,082
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015 |  |  |
Prior service credit | (1,800) |  |
Net actuarial loss | 0 |  |
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Defined benefit plans |  |  |
Service cost | 2,704 | 3,353 | 3,284
Interest cost | 7,628 | 9,115 | 9,337
Expected return on plan assets | (12,713) | (12,147) | (12,096)
Amortization of net prior service (gain) cost | (1,803) | (1,804) | (1,803)
Amortization of net actuarial losses | 98 | 1,102 | 793
Net periodic pension/benefit cost | (4,086) | (381) | (485)
Impact of PUC D&Os | 3,842 | 1,211 | 1,343
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) | (244) | $ 830 | $ 858
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015 |  |  |
Prior service credit | (1,800) |  |
Net actuarial loss | $ 0 |  |

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