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Share-based compensation (Details) | 12 Months Ended
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Dec. 31, 2013
Equity and Incentive Plan (EIP) |
Share-based compensation |
Shares remaining available for future issuance | 3,600,000
Shares that can be issued upon vesting of outstanding units and achievement of performance goals | 2,200,000
Stock Option and Incentive Plan (SOIP) |
Share-based compensation |
Outstanding shares | 2,000
Period of time from grant date after which awards become unrestricted | 4 years
Nonemployee Director Stock Plan |
Share-based compensation |
Shares remaining available for future issuance | 202,460
Long-term incentive plan (LTIP) |
Share-based compensation |
Performance period | 3 years
Exception to forfeiture, minimum requisite service period | 12 months
Stock appreciation rights (SARs) | Stock Option and Incentive Plan (SOIP) |
Share-based compensation |
Percentage of award exercisable in installments | 25.00%
Period during which the award vests and becomes exercisable in installments | 4 years
Period award expires if not exercised | 10 years
Restricted shares | Equity and Incentive Plan (EIP) |
Share-based compensation |
The number of equal annual increments for which the awards become unrestricted (in installments) | 4

X
- Definition The number of annual increments, on the anniversaries of the grant date, upon which restricted awards become unrestricted. + References No definition available. + Details
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X
- Definition Represents the requisite minimum months of service in the performance period required in order to qualify for the forfeiture exception in the event of death, disability and retirement, on completion of requisite minimum months of service. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period + References No definition available. + Details
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- Definition Percentage of vesting of share-based compensation awards. + References No definition available. + Details
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- Definition Represents the number of years over which the award vests and becomes exercisable in installments under the plan. + References No definition available. + Details
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X
- Definition The number of shares reserved for issuance under stock option agreements and other incentive plans, awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Represents the period of time of restricted option become unrestricted from the date of grant. + References No definition available. + Details
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X
- Definition The period of time, from the grant date until the time at which the share-based [option] award expires. + References No definition available. + Details
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X
- Definition Represents the number of shares that could be issued upon vesting of share-based payment awards and achievement of performance goals. + References No definition available. + Details
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X
- Definition Represents the number of authorized but unissued shares that could be issued under the equity-based compensation plan. + References No definition available. + Details
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- Details
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X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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