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Electric utility segment (Details 8) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Net income for common stock | $ 39,013 | $ 48,236 | $ 40,588 | $ 33,679 | $ 13,836 | $ 47,706 | $ 38,800 | $ 38,316 | $ 161,516 | $ 138,658 | $ 138,230
Prior service credit arising during the period, net of taxes |  |  |  |  |  |  |  |  | 0 | 0 | 6,943
Net gains (losses) arising during the period, net of (taxes) benefits |  |  |  |  |  |  |  |  | 223,177 | (99,159) | (130,191)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits |  |  |  |  |  |  |  |  | 23,280 | 15,291 | 9,364
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | (222,595) | 75,471 | 100,692
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 9,673 | (7,286) | (6,665)
Comprehensive income attributable to common shareholder |  |  |  |  |  |  |  |  | 171,189 | 131,372 | 131,565
HECO |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 122,929 | 99,276 | 99,986
Prior service credit arising during the period, net of taxes |  |  |  |  |  |  |  |  |  |  | 6,921
Net gains (losses) arising during the period, net of (taxes) benefits |  |  |  |  |  |  |  |  | 203,479 | (90,082) | (116,726)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits |  |  |  |  |  |  |  |  | 20,694 | 13,673 | 8,372
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | (222,595) | 75,471 | 100,692
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 1,578 | (938) | (741)
Comprehensive income attributable to common shareholder |  |  |  |  |  |  |  |  | 124,507 | 98,338 | 99,245
HELCO |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 20,136 | 16,212 | 26,651
Prior service credit arising during the period, net of taxes |  |  |  |  |  |  |  |  |  |  | 1,419
Net gains (losses) arising during the period, net of (taxes) benefits |  |  |  |  |  |  |  |  | 30,542 | (13,577) | (18,224)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits |  |  |  |  |  |  |  |  | 2,880 | 2,101 | 1,324
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | (33,277) | 11,442 | 15,436
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 145 | (34) | (45)
Comprehensive income attributable to common shareholder |  |  |  |  |  |  |  |  | 20,281 | 16,178 | 26,606
MECO |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 21,277 | 12,627 | 17,974
Prior service credit arising during the period, net of taxes |  |  |  |  |  |  |  |  |  |  | 1,239
Net gains (losses) arising during the period, net of (taxes) benefits |  |  |  |  |  |  |  |  | 27,919 | (10,935) | (16,816)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits |  |  |  |  |  |  |  |  | 2,557 | 1,771 | 1,158
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | (30,377) | 9,093 | 14,366
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 99 | (71) | (53)
Comprehensive income attributable to common shareholder |  |  |  |  |  |  |  |  | 21,376 | 12,556 | 17,921
RHI |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | (3) | (3) | (9)
Prior service credit arising during the period, net of taxes |  |  |  |  |  |  |  |  |  |  | 0
Net gains (losses) arising during the period, net of (taxes) benefits |  |  |  |  |  |  |  |  |  |  | 0
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits |  |  |  |  |  |  |  |  |  |  | 0
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  |  |  | 0
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  |  |  | 0
Comprehensive income attributable to common shareholder |  |  |  |  |  |  |  |  | (3) | (3) | (9)
Consolidating adjustments |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | (41,410) | (28,836) | (44,616)
Prior service credit arising during the period, net of taxes |  |  |  |  |  |  |  |  |  |  | (2,658)
Net gains (losses) arising during the period, net of (taxes) benefits |  |  |  |  |  |  |  |  | (58,461) | 24,512 | 35,040
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits |  |  |  |  |  |  |  |  | (5,437) | (3,872) | (2,482)
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | 63,654 | (20,535) | (29,802)
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (244) | 105 | 98
Comprehensive income attributable to common shareholder |  |  |  |  |  |  |  |  | (41,654) | (28,731) | (44,518)
HECO Consolidated |  |  |  |  |  |  |  |  |  |  |
Net income for common stock | 31,990 | 37,817 | 28,693 | 24,429 | 4,225 | 38,375 | 29,376 | 27,300 | 122,929 | 99,276 | 99,986
Prior service credit arising during the period, net of taxes |  |  |  |  |  |  |  |  | 0 | 0 | 6,921
Net gains (losses) arising during the period, net of (taxes) benefits |  |  |  |  |  |  |  |  | 203,479 | (90,082) | (116,726)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits |  |  |  |  |  |  |  |  | 20,694 | 13,673 | 8,372
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes |  |  |  |  |  |  |  |  | (222,595) | 75,471 | 100,692
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | 1,578 | (938) | (741)
Comprehensive income attributable to common shareholder |  |  |  |  |  |  |  |  | $ 124,507 | $ 98,338 | $ 99,245

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