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Share-based compensation (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based compensation
Share-based compensation expense (in dollars)	$ 2,000,000	$ 2,500,000	$ 7,200,000	$ 6,000,000
Income tax benefit (in dollars)	700,000	900,000	2,600,000	2,200,000
Amount of compensation expense capitalized	40,000	30,000	120,000	90,000
Nonqualified stock options (NQSOs)
Share-based compensation
Shares exercised		0		14,000
Weighted-average exercise price		$ 0.00		$ 20.49
Cash received from exercise (in dollars)		0		287,000
Intrinsic value of shares exercised (in dollars)		0		128,000
Tax benefit realized for the deduction of exercises (in dollars)		0		50,000
Stock appreciation rights (SARs)
Share-based compensation
Number of shares underlying SARs	102,000		102,000
Weighted-average remaining contractual life			6 months
Weighted-average exercise price	$ 26.18		$ 26.18
Hawaiian Electric Company, Inc. and Subsidiaries
Share-based compensation
Share-based compensation expense (in dollars)	600,000	800,000	2,200,000	1,900,000
Income tax benefit (in dollars)	$ 200,000	$ 300,000	$ 900,000	$ 700,000

X

- Definition

Represents the weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

+ References

No definition available.

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The number of shares under the Stock Appreciation Rights plan that validly exist and are outstanding and exercisable for which the share appreciation payment is calculated upon exercise.

+ References

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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