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Basis of presentation (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses | $ 573,985 | $ 521,824
Operating income | 71,889 | 69,738
Retirement defined benefits expense—other than service costs | (1,833) | (1,876)
Increase in accounts, interest and dividends payable | 22,808 | 24,903
Net cash provided by operating activities | 34,677 | 46,991
Capital expenditures | (133,352) | (91,242)
Net cash used in investing activities | (231,051) | (184,481)
Hawaiian Electric Company, Inc. and Subsidiaries |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses | 519,058 | 468,250
Operating income | 51,369 | 50,361
Retirement defined benefits expense—other than service costs | (1,264) | (1,423)
Other operation and maintenance | 107,610 | 98,817
Net cash provided by operating activities | 29,780 | 31,879
Capital expenditures | (114,457) | (84,712)
Net cash used in investing activities | (109,524) | (71,360)
Increase (decrease) in accounts payable | 5,143 | 17,231
Hawaiian Electric Company |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses | 367,414 | 331,903
Operating income | 33,766 | 30,940
Retirement defined benefits expense—other than service costs | (1,062) | (1,285)
Other operation and maintenance | 72,940 | 65,993
Net cash provided by operating activities | 14,702 | 25,639
Capital expenditures | (84,226) | (64,035)
Net cash used in investing activities | (83,630) | (52,749)
Increase (decrease) in accounts payable | (2,028) | 21,943
Hawaii Electric Light Company, Inc. (HELCO) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses | 76,686 | 68,580
Operating income | 11,247 | 10,402
Retirement defined benefits expense—other than service costs | (103) | 83
Other operation and maintenance | 16,098 | 15,599
Net cash provided by operating activities | 16,253 | 10,652
Capital expenditures | (15,161) | (12,434)
Net cash used in investing activities | (14,241) | (14,441)
Increase (decrease) in accounts payable | 4,050 | (1,721)
Maui Electric |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses | 74,958 | 67,767
Operating income | 6,398 | 9,026
Retirement defined benefits expense—other than service costs | (99) | (221)
Other operation and maintenance | 18,572 | 17,225
Net cash provided by operating activities | 5,212 | 2,448
Capital expenditures | (15,070) | (8,243)
Net cash used in investing activities | (2,213) | 330
Increase (decrease) in accounts payable | 3,121 | (2,991)
American Savings Bank (ASB) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses | 50,532 | 48,501
Operating income | 24,887 | 24,355
Retirement defined benefits expense—other than service costs | 387 | 195
Compensation and employee benefits | 24,440 | 23,042
Other expense | 4,101 | 4,506
Electric utility |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses | 519,058 | 468,250
Operating income | 51,369 | 50,361
Bank |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses | 50,532 | 48,501
Operating income | 24,887 | 24,355
Other |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses | 4,395 | 5,073
Operating income | $ (4,367) | (4,978)
As previously filed |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | 523,700
Operating income |  | 67,862
Retirement defined benefits expense—other than service costs |  | 0
As previously filed | Hawaiian Electric Company, Inc. and Subsidiaries |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | 469,673
Operating income |  | 48,938
Retirement defined benefits expense—other than service costs |  | 0
Other operation and maintenance |  | 100,240
As previously filed | Hawaiian Electric Company |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | 333,188
Operating income |  | 29,655
Retirement defined benefits expense—other than service costs |  | 0
Other operation and maintenance |  | 67,278
As previously filed | Hawaii Electric Light Company, Inc. (HELCO) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | 68,497
Operating income |  | 10,485
Retirement defined benefits expense—other than service costs |  | 0
Other operation and maintenance |  | 15,516
As previously filed | Maui Electric |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | 67,988
Operating income |  | 8,805
Retirement defined benefits expense—other than service costs |  | 0
Other operation and maintenance |  | 17,446
As previously filed | American Savings Bank (ASB) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Compensation and employee benefits |  | 23,237
Other expense |  | 4,311
As previously filed | Electric utility |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | 469,673
Operating income |  | 48,938
As previously filed | Bank |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | 48,696
Operating income |  | 24,160
As previously filed | Other |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | 5,331
Operating income |  | (5,236)
Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Increase in accounts, interest and dividends payable |  | (46,943)
Net cash provided by operating activities |  | (46,943)
Capital expenditures |  | 46,943
Net cash used in investing activities |  | 46,943
Adjustment | Hawaiian Electric Company |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | (46,943)
Capital expenditures |  | 46,943
Net cash used in investing activities |  | 46,943
Increase (decrease) in accounts payable |  | (46,943)
Adjustment | ASU 2017-07 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | (1,876)
Operating income |  | 1,876
Retirement defined benefits expense—other than service costs |  | (1,876)
Adjustment | ASU 2017-07 | Hawaiian Electric Company, Inc. and Subsidiaries |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | (1,423)
Operating income |  | 1,423
Retirement defined benefits expense—other than service costs |  | (1,423)
Other operation and maintenance |  | (1,423)
Adjustment | ASU 2017-07 | Hawaiian Electric Company |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | (1,285)
Operating income |  | 1,285
Retirement defined benefits expense—other than service costs |  | (1,285)
Other operation and maintenance |  | (1,285)
Adjustment | ASU 2017-07 | Hawaii Electric Light Company, Inc. (HELCO) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | 83
Operating income |  | (83)
Retirement defined benefits expense—other than service costs |  | 83
Other operation and maintenance |  | 83
Adjustment | ASU 2017-07 | Maui Electric |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | (221)
Operating income |  | 221
Retirement defined benefits expense—other than service costs |  | (221)
Other operation and maintenance |  | (221)
Adjustment | ASU 2017-07 | American Savings Bank (ASB) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Compensation and employee benefits |  | (195)
Other expense |  | 195
Adjustment | ASU 2017-07 | Electric utility |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | (1,423)
Operating income |  | 1,423
Adjustment | ASU 2017-07 | Bank |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | (195)
Operating income |  | 195
Adjustment | ASU 2017-07 | Other |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Costs and expenses |  | (258)
Operating income |  | $ 258

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