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Electric utility segment - Consolidating statement of changes in common stock equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Beginning Balance $ 1,927,640 $ 1,790,573
Net income for common stock 32,352 31,866
Other comprehensive income, net of taxes 8,800 4,058
Common stock dividends (33,367) (31,840)
Ending Balance 1,942,179 1,897,909
Hawaiian Electric Company    
Beginning Balance 1,728,325 1,682,144
Net income for common stock 25,367 26,874
Other comprehensive income, net of taxes 1,016 22
Common stock dividends (23,400) (22,601)
Common stock issuance expenses (4) (5)
Ending Balance 1,731,304 1,686,434
HELCO    
Beginning Balance 292,702 281,846
Net income for common stock 3,962 3,788
Other comprehensive income, net of taxes 0 0
Common stock dividends (3,302) (2,505)
Common stock issuance expenses (4) 0
Ending Balance 293,358 283,129
Maui Electric    
Beginning Balance 263,725 256,692
Net income for common stock 3,967 3,904
Other comprehensive income, net of taxes 0 0
Common stock dividends (3,265) (3,794)
Common stock issuance expenses (1) 0
Ending Balance 264,426 256,802
Other subsidiaries    
Beginning Balance 101 101
Net income for common stock 0 0
Other comprehensive income, net of taxes 0 0
Ending Balance 101 101
Consolidating adjustments    
Beginning Balance (556,528) (538,639)
Net income for common stock (7,929) (7,692)
Other comprehensive income, net of taxes 0 0
Common stock dividends 6,567 6,299
Common stock issuance expenses 5 0
Ending Balance (557,885) (540,032)
Hawaiian Electric Company, Inc. and Subsidiaries    
Beginning Balance 1,728,325 1,682,144
Net income for common stock 25,367 26,874
Other comprehensive income, net of taxes 1,016 22
Common stock dividends (23,400) (22,601)
Common stock issuance expenses (4) (5)
Ending Balance $ 1,731,304 $ 1,686,434