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Share-Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The following is a summary of the significant assumptions used to value both the Performance-Based LTIP and Special Performance-Based LTIP Units:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Expected volatility | 19.0% to 23.0% |  | 19.9% to 26.0% |  | 18.0 | %
Dividend yield | 2.3% to 2.5% |  | 2.5% to 2.7% |  | 2.3 | %
Risk-free interest rate | 2.3% to 2.6% |  | 2.3% to 3.0% |  | 1.5 | %
The following is a summary of both the Performance-Based LTIP and Special Performance-Based LTIP Units activity:
| Unvested Shares |  | Weighted Average Grant-Date Fair Value
Unvested at December 31, 2018 | 1,657,578 |  |  | $ | 18.27 |
Granted | 478,411 |  |  | 19.49 |
Forfeited | (18,054 | ) |  | 18.00 |
Unvested at December 31, 2019 | 2,117,935 |  |  | 18.55 |
The following is a summary of the significant assumptions used to value the Formation Awards:
| Year Ended December 31,
| 2018 |  | 2017
Expected volatility | 27.0% to 29.0% |  | 26.0 | %
Dividend yield | 2.5% to 2.7% |  | 2.3 | %
Risk-free interest rate | 2.8% to 3.0% |  | 2.3 | %
Expected life | 7 years |  | 7 years |
The following is a summary of the Formation Awards activity:
| Unvested Shares |  | Weighted Average Grant-Date Fair Value
Unvested at December 31, 2018 | 2,655,394 |  |  | $ | 8.81 |
Vested | (160,746 | ) |  | 8.84 |
Forfeited | (9,702 | ) |  | 8.55 |
Unvested at December 31, 2019 | 2,484,946 |  |  | 8.81 |
The following is a summary of the significant assumptions used to value the Granted LTIPs:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Expected volatility | 18.0% to 24.0% |  | 20.0% to 22.0% |  | 17.0% to 19.0%
Risk-free interest rate | 2.3% to 2.6% |  | 1.9% to 2.6% |  | 1.3% to 1.5%
Post-grant restriction periods | 2 to 3 years |  | 2 to 3 years |  | 2 to 3 years
The following is a summary of the Granted LTIP activity:
| Unvested Shares |  | Weighted Average Grant-Date Fair Value
Unvested at December 31, 2018 | 962,662 |  |  | $ | 34.03 |
Granted | 493,777 |  |  | 34.40 |
Vested | (360,703 | ) |  | 33.15 |
Forfeited | (393 | ) |  | 34.52 |
Unvested at December 31, 2019 | 1,095,343 |  |  | 34.35 |
The total-grant date fair value of the Granted LTIPs that vested for each of the three years in the period ended December 31, 2019 was $12.0 million, $3.6 million and $2.5 million. In 2020, we issued 471,598 LTIP Units to management and employees with an estimated aggregate grant-date fair value of $18.3 million. The following is a summary of the OP Units activity:
| Unvested Shares |  | Weighted Average Grant-Date Fair Value
Unvested at December 31, 2018 | 2,999,987 |  |  | $ | 33.39 |
Vested | (127,735 | ) |  | 33.39 |
Unvested at December 31, 2019 | 2,872,252 |  |  | 33.39 |
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Expected volatility | 19.0% to 23.0% |  | 19.9% to 26.0% |  | 18.0 | %
Dividend yield | 2.3% to 2.5% |  | 2.5% to 2.7% |  | 2.3 | %
Risk-free interest rate | 2.3% to 2.6% |  | 2.3% to 3.0% |  | 1.5 | %
The following is a summary of both the Performance-Based LTIP and Special Performance-Based LTIP Units activity:
| Unvested Shares |  | Weighted Average Grant-Date Fair Value
Unvested at December 31, 2018 | 1,657,578 |  |  | $ | 18.27 |
Granted | 478,411 |  |  | 19.49 |
Forfeited | (18,054 | ) |  | 18.00 |
Unvested at December 31, 2019 | 2,117,935 |  |  | 18.55 |
In 2020, we issued 593,100 Performance-Based LTIP Units to management and employees with an estimated aggregate grant-date fair value of $11.1 million. JBG SMITH 2017 ESPP The JBG SMITH 2017 ESPP authorized the issuance of up to 2.1 million common shares. The ESPP provides eligible employees an option to purchase, through payroll deductions, our common shares at a discount of 15.0% of the closing price of a common share on relevant determination dates, provided that the fair market value of common shares, determined as of the first day of the relevant offering period, purchased by any eligible employee may not exceed $25,000 in any calendar year. The maximum aggregate number of common shares reserved for issuance under the ESPP will automatically increase on January 1 of each year, unless the Compensation Committee of the Board of Trustees determines to limit any such increase, by the lesser of (i) 0.10% of the total number of outstanding common shares on December 31 of the preceding calendar year or (ii) 206,600 common shares. Pursuant to the ESPP, employees purchased 47,022 and 20,178 common shares for $1.5 million and $597,000 during the years ended December 31, 2019 and 2018. The following is a summary of the significant assumptions used to value the ESPP common shares using the Black-Scholes model:
| Year Ended December 31,
| 2019 |  | 2018
Expected volatility | 18.0% to 28.0% |  | 21.0 | %
Dividend yield | 2.6% to 3.5% |  | 2.5 | %
Risk-free interest rate | 2.2% to 2.4% |  | 2.0 | %
Expected life | 6 months |  | 6 months |
As of December 31, 2019, there were 2.0 million common shares available for issuance under the ESPP.
Summary of Share-Based Compensation Expense | The following is a summary of share-based compensation expense:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
| (In thousands)
Time-Based LTIP Units | $ | 11,386 |  |  | $ | 10,095 |  |  | $ | 2,211 |
Performance-Based LTIP Units | 8,716 |  |  | 5,271 |  |  | 1,172 |
LTIP Units | 1,000 |  |  | 794 |  |  | — |
Other equity awards (1) | 4,535 |  |  | 3,826 |  |  | 1,526 |
Share-based compensation expense - other | 25,637 |  |  | 19,986 |  |  | 4,909 |
Formation Awards | 5,734 |  |  | 5,606 |  |  | 5,169 |
OP Units (2) | 29,826 |  |  | 29,455 |  |  | 21,467 |
LTIP Units (2) | 456 |  |  | 277 |  |  | 2,615 |
Special Performance-Based LTIP Units (3) | 2,843 |  |  | 323 |  |  | — |
Special Time-Based LTIP Units (3) | 3,303 |  |  | 369 |  |  | — |
Share-based compensation related to Formation Transaction and special equity awards (4) | 42,162 |  |  | 36,030 |  |  | 29,251 |
Total share-based compensation expense | 67,799 |  |  | 56,016 |  |  | 34,160 |
Less amount capitalized | (2,526 | ) |  | (3,341 | ) |  | (467 | )
Share-based compensation expense | $ | 65,273 |  |  | $ | 52,675 |  |  | $ | 33,693 |
______________________________________________
(1) | For the years ended December 31, 2019 and 2018, primarily includes 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 ESPP. For the year ended December 31, 2017, represents share-based compensation expense related to equity awards prior to the Formation Transaction.
(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. |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=109197908&loc=d3e5070-113901 + Details
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