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Share-Based Compensation | 6 Months Ended
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Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation Performance Share Units (“PSUs”) On March 1, 2012, our Board of Trustees granted 54,070 PSUs with an aggregate grant date fair value of $1.8 million to executives. The PSUs have a performance period beginning on January 1, 2012 and concluding on the earlier of December 31, 2014 or the date of: (1) termination by the Company without cause, death or disability of the executive or constructive discharge of the executive (collectively, “qualified termination”); or (2) a sale event. The number of PSUs earned (“earned PSUs”) at the end of the performance period will be determined based on the percentile rank of the Company’s total shareholder return relative to a peer group of companies, as set forth in the following schedule:
Percentile Rank |  | Earned PSUs Payout %
75th or greater |  | 200% of PSUs granted
50th or greater |  | 100% of PSUs granted
25th |  | 50% of PSUs granted
Below 25th |  | 0% of PSUs granted
If the percentile rank exceeds the 25th percentile and is between two of the percentile ranks set forth in the table above, then the percentage of the earned PSUs will be interpolated between the ranges set forth in the table above to reflect any performance between the listed percentiles. At the end of the performance period, we, in settlement of the award, will issue a number of fully-vested common shares equal to the sum of:
• | the number of earned PSUs in settlement of the award plan; plus
• | the aggregate dividends that would have been paid with respect to the common shares issued in settlement of the earned PSUs through the date of settlement had such shares been issued on the grant date, divided by the share price on such settlement date, as defined under the terms of the agreement.
If a performance period ends due to a sale event or qualified termination, the number of earned PSUs is prorated based on the portion of the three-year performance period that has elapsed. If employment is terminated by the employee or by the Company for cause, all PSUs are forfeited. PSUs do not carry voting rights. We computed a grant date fair value of $32.77 per PSU using a Monte Carlo model, which included assumptions of, among other things, the following: baseline common share value of $24.39; expected volatility for our common shares of 43.2%; and risk-free interest rate of 0.41%. We are recognizing the grant date fair value in connection with these PSU awards over the performance period. All PSUs granted on March 4, 2010 and outstanding at December 31, 2011 were held by Mr. Randall M. Griffin, our Chief Executive Officer, and were terminated upon his retirement on March 31, 2012. Based on the Company’s total shareholder return relative to its peer group of companies, there was no payout value in connection with the termination of the PSUs. The PSUs granted to our executives on March 3, 2011, as described in our 2011 Annual Report on Form 10-K, were outstanding at June 30, 2012. Restricted Shares During the six months ended June 30, 2012, certain employees as well as nonemployee members of our Board of Trustees were granted a total of 152,274 restricted shares with an aggregate grant date fair value of $3.6 million (weighted average of $24.16 per share). Restricted shares granted to employees vest based on increments and over periods of time set forth under the terms of the respective awards provided that the employees remain employed by us. The grants of restricted shares to nonemployee Trustees vest on the first anniversary of the grant date provided that the Trustee remains in his or her position. During the six months ended June 30, 2012, forfeiture restrictions lapsed on 355,333 previously issued common shares; these shares had a weighted average grant date fair value of $32.91 per share, and the aggregate intrinsic value of the shares on the vesting dates was $8.6 million. Options During the six months ended June 30, 2012, 12,667 options to purchase common shares (“options”) were exercised. The weighted average exercise price of these options was $15.01 per share, and the aggregate intrinsic value of the options exercised was $110,000.

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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 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -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 5: 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 6: 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 7: 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 8: 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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