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Quarterly information (unaudited) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 826,447,000 | $ 831,229,000 | $ 796,730,000 | $ 784,064,000 | $ 838,147,000 | $ 867,720,000 | $ 854,268,000 | $ 814,860,000 | $ 3,238,470,000 | $ 3,374,995,000 | $ 3,242,335,000
Operating income | 72,293,000 | 90,099,000 | 82,370,000 | 70,657,000 | 37,272,000 | 91,702,000 | 79,406,000 | 75,816,000 | 315,419,000 | 284,196,000 | 289,696,000
Net income | 39,486,000 | 48,707,000 | 41,061,000 | 34,152,000 | 14,309,000 | 48,177,000 | 39,273,000 | 38,789,000 | 163,406,000 | 140,548,000 | 140,120,000
Net income for common stock | 39,013,000 | 48,236,000 | 40,588,000 | 33,679,000 | 13,836,000 | 47,706,000 | 38,800,000 | 38,316,000 | 161,516,000 | 138,658,000 | 138,230,000
Basic earnings per common share (in dollars per share) | $ 0.39 | $ 0.49 | $ 0.41 | $ 0.34 | $ 0.14 | $ 0.49 | $ 0.40 | $ 0.40 | $ 1.63 | $ 1.43 | $ 1.45
Diluted earnings per common share (in dollars per share) | $ 0.39 | $ 0.48 | $ 0.41 | $ 0.34 | $ 0.14 | $ 0.49 | $ 0.40 | $ 0.40 | $ 1.62 | $ 1.42 | $ 1.44
Dividends per common share (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.31 | $ 1.24 | $ 1.24 | $ 1.24
Market price per common share |  |  |  |  |  |  |  |  |  |  |
High end of range (in dollars per share) | $ 27.15 | $ 27.24 | $ 28.30 | $ 27.92 | $ 26.75 | $ 29.24 | $ 28.87 | $ 26.79 | $ 28.30 | $ 29.24 |
Low end of range (in dollars per share) | $ 24.51 | $ 24.12 | $ 23.84 | $ 25.50 | $ 23.65 | $ 26.26 | $ 24.65 | $ 24.86 | $ 23.84 | $ 23.65 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | 764,096,000 | 766,115,000 | 730,688,000 | 719,273,000 | 769,182,000 | 801,095,000 | 789,552,000 | 749,610,000 | 2,980,172,000 | 3,109,439,000 | 2,978,690,000
Operating income | 59,508,000 | 71,914,000 | 61,138,000 | 52,953,000 | 19,443,000 | 74,819,000 | 61,496,000 | 57,254,000 | 245,513,000 | 213,012,000 | 215,134,000
Net income | 32,489,000 | 38,315,000 | 29,192,000 | 24,928,000 | 4,724,000 | 38,873,000 | 29,875,000 | 27,799,000 | 124,924,000 | 101,271,000 | 101,981,000
Net income for common stock | 31,990,000 | 37,817,000 | 28,693,000 | 24,429,000 | 4,225,000 | 38,375,000 | 29,376,000 | 27,300,000 | 122,929,000 | 99,276,000 | 99,986,000
Market price per common share |  |  |  |  |  |  |  |  |  |  |
Amount of CIS project costs written down by electric utilities |  |  |  |  | $ 24,000,000 |  |  |  |  |  |

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