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Share and Unit-Based Plans | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Share and Unit-Based Plans | Share and Unit-Based Plans: Under the Long-Term Incentive Plan ("LTIP"), each award recipient is issued a form of units ("LTIP Units") in the Operating Partnership. Upon the occurrence of specified events and subject to the satisfaction of applicable vesting conditions, LTIP Units (after conversion into OP Units) are ultimately redeemable for common stock of the Company, or cash at the Company's option, on a one-unit for one-share basis. LTIP Units receive cash dividends based on the dividend amount paid on the common stock of the Company. The LTIP may include both market-indexed awards and service-based awards. The market-indexed LTIP Units vest over the service period of the award based on the percentile ranking of the Company in terms of total return to stockholders (the "Total Return") per share of common stock relative to the Total Return of a group of peer REITs, as measured at the end of the measurement period. During the nine months ended September 30, 2019, the Company granted the following LTIP Units:
Grant Date |  | Units |  | Type |  | Fair Value per LTIP Unit |  | Vest Date
1/1/2019 |  | 81,732 |  |  | Service-based |  | $ | 43.28 |  |  | 12/31/2021
1/1/2019 |  | 250,852 |  |  | Market-indexed |  | $ | 29.25 |  |  | 12/31/2021
9/1/2019 |  | 4,393 |  |  | Service-based |  | $ | 28.53 |  |  | 8/31/2022
9/1/2019 |  | 6,454 |  |  | Market-indexed |  | $ | 19.42 |  |  | 8/31/2022
|  | 343,431 |  |  |  |  |  |  |
The fair value of the market-indexed LTIP Units (Level 3) granted on January 1, 2019 was estimated on the date of grant using a Monte Carlo Simulation model that assumed a risk free interest rate of 2.46% and an expected volatility of 23.52%. The fair value of the market-indexed LTIP Units (Level 3) granted on September 1, 2019 was estimated on the date of grant using a Monte Carlo Simulation model that assumed a risk free interest rate of 1.42% and an expected volatility of 24.91%. The following table summarizes the activity of the non-vested LTIP Units, phantom stock units and stock units:
| LTIP Units |  |  |  |  |  |  |  | Phantom Stock Units |  |  |  | Stock Units |  |
| Units |  | Value(1) |  |  |  |  |  | Units |  | Value(1) |  | Units |  | Value(1)
Balance at January 1, 2019 | 661,578 |  |  | $ | 48.38 |  |  |  |  |  |  | — |  |  | $ | — |  |  | 129,457 |  |  | $ | 64.21 |
Granted | 343,431 |  |  | 32.40 |  |  |  |  |  |  | 21,580 |  |  | 41.61 |  |  | 159,116 |  |  | 37.57 |
Vested | (7,654) |  |  | 59.85 |  |  |  |  |  |  | (12,756) |  |  | 42.87 |  |  | (83,341) |  |  | 63.63 |
Forfeited | (14,635) |  |  | 34.26 |  |  |  |  |  |  | — |  |  | — |  |  | (5,245) |  |  | 51.48 |
Balance at September 30, 2019 | 982,720 |  |  | $ | 42.91 |  |  |  |  |  |  | 8,824 |  |  | $ | 39.79 |  |  | 199,987 |  |  | $ | 43.59 |
(1) Value represents the weighted average grant date fair value. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The following table summarizes the activity of the stock options outstanding:
|  |  |  |  | Stock Options |  |
|  |  |  |  | Units |  | Value(1)
Balance at January 1, 2019 |  |  |  |  | 35,565 |  |  | $ | 57.32 |
Granted |  |  |  |  | — |  |  | — |
Exercised |  |  |  |  | — |  |  | — |
Balance at September 30, 2019 |  |  |  |  | 35,565 |  |  | $ | 57.32 |
(1) Value represents the weighted average exercise price. |  |  |  |  |  |  |
The following summarizes the compensation cost under the share and unit-based plans:
| For the Three Months Ended September 30, |  |  |  | For the Nine Months Ended September 30, |  |
| 2019 |  | 2018 |  | 2019 |  | 2018
LTIP Units | $ | 2,498 |  |  | $ | 3,440 |  |  | $ | 8,859 |  |  | $ | 21,823 |
Stock units | 632 |  |  | 972 |  |  | 3,836 |  |  | 5,717 |
Stock options | — |  |  | 32 |  |  | 51 |  |  | 94 |
Phantom stock units | 185 |  |  | 172 |  |  | 607 |  |  | 585 |
| $ | 3,315 |  |  | $ | 4,616 |  |  | $ | 13,353 |  |  | $ | 28,219 |
The Company capitalized share and unit-based compensation costs of $993 and $1,062 for the three months ended September 30, 2019 and 2018, respectively, and $3,598 and $5,575 for the nine months ended September 30, 2019 and 2018, respectively. Unrecognized compensation costs of share and unit-based plans at September 30, 2019 consisted of $4,159 from LTIP Units, $3,657 from stock units and $351 from phantom stock units.

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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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