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Long-Term Compensation | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Long-Term Compensation | Long-Term Compensation Awards with Performance Measures During the six months ended June 30, 2021, 58,568 performance units ("Performance Units") and 263,621 RLP Units ("Performance RLP Units" and, together with the Performance Units, collectively the "Performance Awards") were granted to certain employees based on performance-based criteria, which had a fair value of approximately $7,162 on the grant date as determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation. A portion of each Performance Award vests based upon the total shareholder return ("TSR") of the Company's common stock compared to the TSR of the FTSE Nareit All Equity Index and the remainder vests based upon the TSR of the Company’s common stock compared to nine other peer industrial real estate companies. The performance period for these Performance Awards is three years. Compensation expense is charged to earnings over the applicable vesting period for the Performance Awards. At the end of the measuring period, vested Performance Units convert into shares of common stock. Service Based Awards For the six months ended June 30, 2021, 67,127 shares of restricted stock units ("Service Units") and 51,525 RLP Units ("Service RLP Units" and together with the Service Units, collectively the "Service Awards") were granted to certain employees and outside directors based on service-based criteria, which had an aggregate fair value of approximately $5,195 on the grant date. The Service Awards granted to employees generally vest ratably over three years based on continued employment. Service Awards granted to outside directors vest after one year. Compensation expense is charged to earnings over the vesting periods for the Service Awards. At the end of the service period, vested Service Units convert into shares of common stock. Retirement Eligibility Commencing January 1, 2020, all award agreements issued underlying Performance Awards and Service Awards contain a retirement benefit for employees with at least 10 years of continuous service and are at least 60 years old. For employees that meet the age and service eligibility requirements, their awards are non-forfeitable. As such, during the six months ended June 30, 2021, we expensed 100% of the awards granted to retirement-eligible employees at the grant date as if fully vested. For employees who will meet the age and service eligibility requirements during the normal vesting periods, the grants are amortized over the shorter service period. Outstanding Performance Awards and Service Awards We recognized $3,451 and $3,108 for the three months ended June 30, 2021 and 2020, respectively, and $7,064 and $6,749 for the six months ended June 30, 2021 and 2020, respectively, in compensation expense related to the amortization of the Service Awards and the Performance Awards. Service Award and Performance Award amortization capitalized in connection with development activities was $507 and $330 for the three months ended June 30, 2021 and 2020, respectively, and $1,210 and $1,312 for the six months ended June 30, 2021 and 2020, respectively. At June 30, 2021, we had $17,776 in unrecognized compensation related to unvested Service Awards and Performance Awards. The weighted average period that the unrecognized compensation is expected to be recognized is 0.91 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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