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Earnings per share and shareholders' equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 19, 2013 | Mar. 20, 2013 | Mar. 19, 2013
Earnings per share, basic and diluted |  |  |  |  |
Distributed earnings, basic and diluted | $ 0.31 | $ 0.31 |  |  |
Undistributed earnings, basic and diluted | $ 0.14 | $ 0.03 |  |  |
Earnings per share, basic and diluted | $ 0.45 | $ 0.34 |  |  |
Antidilutive effect of HEI common stock |  |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) |  | 0 |  |  |
Equity forward transaction |  |  |  |  |
Public offering related to equity forward transaction (in shares) |  |  |  |  | 6,100,000
Sale of common stock related to equity forward transaction (in dollars per share) | $ 26.75 |  |  |  | $ 26.75
Underwriting discount (in dollars per share) | $ 1.00312 |  |  |  |
Closing price of common stock (in dollar per share) |  |  |  |  | $ 27.01
Offering related to underwriters exercising their over-allotment option under equity forward transaction (in shares) |  |  |  | 900,000 |
Shares borrowed by forward counterparty from third party | 7,000,000 |  |  |  |
Underwriting discount |  |  | $ 1.3 |  |
Common Stock, Capital Shares Reserved for Future Issuance, Equity Forward Transaction | 5,700,000 |  |  |  |
Forward sale price (in dollars per share) | $ 25.74688 |  |  |  |
Initial fair value (in dollars per share) | $ 0 |  |  |  |
Cash in exchange of physical delivery of shares on settlement | 139 |  |  |  |
Delivery of cash on settlement | 6.0 |  | 32.1 |  |
Underwriting discount included in delivery of cash | $ 6 |  |  |  |
Delivery of net shares on settlement | 220,000 |  | 1,300,000 |  |
Stock appreciation rights (SARs) | Common stock |  |  |  |  |
Antidilutive effect of HEI common stock |  |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) | 102,000 |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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