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Share-Based Payments (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Share-Based Compensation Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2020 |  | 2019
​ |  | (In thousands)
Time-Based LTIP Units | ​ | $ | 3,351 | ​ | $ | 2,934
Performance-Based LTIP Units | ​ |  | 3,989 | ​ |  | 2,208
Other equity awards (1) | ​ |  | 1,549 | ​ |  | 1,059
Share-based compensation expense - other | ​ |  | 8,889 | ​ |  | 6,201
Formation Awards | ​ |  | 1,259 | ​ |  | 1,660
OP Units (2) | ​ |  | 6,641 | ​ |  | 7,931
LTIP Units (2) | ​ |  | 112 | ​ |  | 108
Special Performance-Based LTIP Units (3) | ​ |  | 671 | ​ |  | 644
Special Time-Based LTIP Units (3) | ​ |  | 758 | ​ |  | 788
Share-based compensation related to Formation Transaction and special equity awards (4) | ​ |  | 9,441 | ​ |  | 11,131
Total share-based compensation expense | ​ |  | 18,330 | ​ |  | 17,332
Less amount capitalized | ​ |  | (968) | ​ |  | (743)
Share-based compensation expense | ​ | $ | 17,362 | ​ | $ | 16,589
(1) | Primarily comprising compensation expense for certain executives who have elected to receive all or a portion of any cash bonus that may be paid in the subsequent year related to past service in the form of fully vested LTIP Units and related to our employee share purchase plan.
(2) | Represents share-based compensation expense for LTIP Units and OP Units subject to post-Combination employment obligations.
(3) | Represents equity awards issued related to our successful pursuit of Amazon's additional headquarters in National Landing.
(4) | Included in "General and administrative expense: Share-based compensation related to Formation Transaction and special equity awards" in the accompanying statements of operations.
LTIP and Time-Based LTIP Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of of the significant assumptions of awards | ​
​ | ​ | ​ | ​
Expected volatility |  | 18.0 | %
Risk-free interest rate |  | 1.5 | %
Post-grant restriction periods |  | 2 years | ​
​ In April 2020, as part of their annual compensation, we granted a total of 54,607 fully vested LTIP Units to certain of our trustees with an aggregate grant-date fair value of $1.5 million.
Performance Shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of of the significant assumptions of awards | ​
​ | ​ | ​ | ​
Expected volatility |  | 15.0 | %
Dividend yield |  | 2.3 | %
Risk-free interest rate |  | 1.3 | %

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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