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Share-based compensation (Details) | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 Long-term incentive plan (LTIP) | May 31, 2010 Equity and Incentive Plan (EIP) | Dec. 31, 2011 Equity and Incentive Plan (EIP) Restricted shares installment | Dec. 31, 2011 Equity and Incentive Plan (EIP) Restricted stock units | Dec. 31, 2011 Stock Option and Incentive Plan (SOIP) Y | Dec. 31, 2011 Stock Option and Incentive Plan (SOIP) Nonqualified stock options (NQSOs) Y | Dec. 31, 2011 Stock Option and Incentive Plan (SOIP) Stock appreciation rights (SARs) Y
Share-based compensation |  |  |  |  |  |  |
Reduction in shares available for grant due to share awards granted | 368,323 |  | 72,036 | 713,144 |  |  |
Reduction in shares available for grant for each share award granted |  |  | 4 | 4 |  |  |
Aggregate shares of issuance of common stock approved by shareholders |  | 4,000,000 |  |  |  |  |
Cumulative shares granted |  |  | 18,009 | 178,286 |  |  |
Outstanding shares |  |  |  |  | 600,000 |  |
Percentage of award exercisable in installments (as a percent) |  |  |  |  |  | 25% | 25%
Period during which the award vests and becomes exercisable in installments (in years) |  |  |  |  |  | 4 | 4
Period award expires if not exercised (in years) |  |  |  |  |  | Ten years | Ten years
The number of equal annual increments for which the awards become unrestricted (in installments) |  |  | 4 |  |  |  |
Period of time from grant date after which awards become unrestricted (in years) |  |  |  |  | 4 |  |
Performance period (in years) | 3 years |  |  |  |  |  |
Exception to forfeiture, minimum requisite service period (in months) | 12 months |  |  |  |  |  |

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- Definition Represents the number of shares counted against the shares available for issuance for every restricted share issued. + References No definition available. + Details
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- 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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- 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 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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- 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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- 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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- Definition The cumulative number of share awards issued as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the total number of shares counted against the shares available for issuance through the balance sheet date. + References No definition available. + Details
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- Definition The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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