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Equity Incentive Plan | 9 Months Ended
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Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Equity Incentive Plan | Equity Incentive Plan The Company may issue equity-based awards to officers, employees, non-employee trustees and other eligible persons under the 2011 Plan. The 2011 Plan provides for a maximum of 5,000,000 common shares of beneficial interest to be issued in the form of share options, share appreciation rights, restricted share awards, unrestricted share awards, share units, dividend equivalent rights, long-term incentive units, other equity-based awards and cash bonus awards. Share Awards From time to time, the Company may award non-vested restricted shares under the 2011 Plan, as compensation to officers, employees and non-employee trustees. The shares issued to officers and employees vest over a period of time as determined by the board of trustees at the date of grant. The Company recognizes compensation expense for time-based non-vested shares on a straight-line basis over the vesting period based upon the fair market value of the shares on the date of issuance, adjusted for forfeitures. The Company may also award unrestricted shares under the 2011 Plan as compensation to non-employee trustees that would otherwise be paid in cash for their services. The shares issued to trustees are unrestricted and include no vesting conditions. The Company recognizes compensation expense for the unrestricted shares issued in lieu of cash compensation on the date of issuance based upon the fair market value of the shares on that date. A summary of the non-vested shares as of September 30, 2014 is as follows:
| 2014
| Number of Shares |  | Weighted-Average Grant Date Fair Value
Unvested at January 1, | 932,800 |  |  | $ | 18.99 |
Granted (1) | 347,247 |  |  | 24.44 |
Vested (1) | (398,599 | ) |  | 19.34 |
Forfeited | (8,716 | ) |  | 23.06 |
Unvested at September 30, | 872,732 |  |  | $ | 20.96 |
(1) | Includes 3,360 unrestricted shares issued in lieu of cash compensation to non-employee trustees at a weighted-average grant date fair value of $28.07.
For the three and nine months ended September 30, 2014, the Company recognized approximately $2.7 million and $7.9 million, respectively, of share-based compensation expense related to restricted share awards. For the three and nine months ended September 30, 2013, the Company recognized $2.2 million and $6.3 million, respectively, of share-based compensation expense related to restricted share awards. As of September 30, 2014, there was $17.0 million of total unrecognized compensation costs related to non-vested share awards and these costs were expected to be primarily recognized over a weighted-average period of 2.3 years. The total fair value of shares vested (calculated as number of shares multiplied by vesting date share price) during the nine months ended September 30, 2014 was approximately $11.0 million. Performance Units The Company awarded performance units to certain employees under the 2011 Plan. The performance units vest over a four-year period, including three years of performance-based vesting ("measurement period") plus an additional one year of time-based vesting. As of September 30, 2014, there were 1.0 million unvested performance units with a weighted-average grant date fair value of $15.36 per performance unit. For the three and nine months ended September 30, 2014, the Company recognized $1.1 million and $3.4 million, respectively, of share-based compensation expense related to the performance units. For the three and nine months ended September 30, 2013, the Company recognized $1.1 million and $3.4 million, respectively, of share-based compensation expense related to the performance units. As of September 30, 2014, there was $5.6 million of total unrecognized compensation cost related to the performance units and these costs are expected to be recognized over a weighted-average period of 1.3 years. As of September 30, 2014, there were 2,739,596 common shares available for future grant under the 2011 Plan. Any performance units that convert into restricted shares will reduce the number of common shares available for future grant under the 2011 Plan.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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