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Incentive Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Components of Stock-Based Compensation Expense | The following table summarizes the components of stock-based compensation expense for the years ended December 31, 2019, 2018 and 2017.
| For the Year Ended December 31, |
(Amounts in thousands) | 2019 |  |  | 2018 |  |  | 2017 |
LTIP units | $ | 11,860 |  |  | $ | 9,059 |  |  | $ | 6,572 |
Performance-based units |  | 8,477 |  |  |  | 7,645 |  |  |  | 6,421 |
Restricted stock |  | 1,228 |  |  |  | 988 |  |  |  | 715 |
Stock options |  | 1,295 |  |  |  | 1,954 |  |  |  | 2,214 |
Total stock-based compensation expense | $ | 22,860 |  |  | $ | 19,646 |  |  | $ | 15,922 |
Summary of Weighted-average assumptions for grants using Option-pricing model | The fair value of the option was estimated using an option-pricing model with the following weighted-average assumptions for grants in year ended December 31, 2017.
| For the Year Ended December 31, |
|  | 2017 |
Expected volatility |  | 29.0% |
Expected life |  | 5.9 years |
Risk free interest rate |  | 2.2% |
Expected dividend yield |  | 2.3% |
Performance Programs [Member] |
Summary of LTIP Unit and Restricted Stock Activity | The following table summarizes our LTIP unit activity granted under the Performance Programs for the year ended December 31, 2019.
| Units |  |  | Weighted-Average Grant-Date Fair Value (per unit) |
Unvested as of December 31, 2018 |  | 3,373,570 |  |  | $ | 7.27 |
Granted |  | 1,356,630 |  |  |  | 5.98 |
Cancelled or expired |  | (1,134,366 | ) |  |  | 8.05 |
Unvested as of December 31, 2019 |  | 3,595,834 |  |  | $ | 6.54 |
Restricted Stock [Member] |
Summary of LTIP Unit and Restricted Stock Activity | The table below summarizes our restricted stock activity for the year ended December 31, 2019.
| Shares |  |  | Weighted-Average Grant-Date Fair Value |
Unvested as of December 31, 2018 |  | 162,981 |  |  | $ | 15.26 |
Granted |  | 93,308 |  |  |  | 13.27 |
Vested |  | (63,821 | ) |  |  | 15.27 |
Cancelled or expired |  | (23,998 | ) |  |  | 14.44 |
Unvested as of December 31, 2019 |  | 168,470 |  |  | $ | 14.27 |
Employee Stock Option [Member] |
Summary of Stock Option Activity | The following table summarizes our stock option activity for year ended December 31, 2019.
|  | Shares |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Outstanding as of December 31, 2018 |  |  | 2,131,943 |  |  | $ | 17.08 |  |  |  |  |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Cancelled or expired |  |  | (47,000 | ) |  |  | 17.50 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2019 |  |  | 2,084,943 |  |  | $ | 17.07 |  |  |  | 5.7 |  |  | $ | - |
Options vested and expected to vest as of December 31, 2019 |  |  | 2,073,791 |  |  | $ | 17.07 |  |  |  | 5.7 |  |  | $ | - |
Options exercisable as of December 31, 2019 |  |  | 1,939,398 |  |  | $ | 17.07 |  |  |  | 5.6 |  |  | $ | - |
LTIP Units [Member] |
Summary of LTIP Unit and Restricted Stock Activity | The following table summarizes our LTIP unit activity for the year ended December 31, 2019.
| Units |  |  | Weighted-Average Grant-Date Fair Value |
Unvested as of December 31, 2018 |  | 1,284,083 |  |  | $ | 14.41 |
Granted |  | 1,067,854 |  |  |  | 12.26 |
Vested |  | (752,645 | ) |  |  | 13.73 |
Cancelled or expired |  | (27,828 | ) |  |  | 13.13 |
Unvested as of December 31, 2019 |  | 1,571,464 |  |  | $ | 13.30 |

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