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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock-Based Compensation [Abstract] |
Summary of recognized stock-based compensation expense | The following table summarizes share-based compensation expense recognized:
|  | Years ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Restricted stock units |  | $ | 5,061 |  |  | $ | 5,931 |  |  | $ | 4,603 |
Phantom stock units |  |  | 215 |  |  |  | 177 |  |  |  | 214 |
Total |  | $ | 5,276 |  |  | $ | 6,108 |  |  | $ | 4,817 |
Summary of unrecognized compensation cost and weighted average remaining amortization periods | The following table summarizes unrecognized compensation cost and the weighted average remaining amortization periods at December 31, 2020 (amortization periods in years):
|  | Unrecognized Compensation Cost |  |  | Weighted Average Remaining Amortization Periods |
Restricted stock units |  | $ | 2,760 |  |  |  | 0.8 |
Phantom stock units |  |  | - |  |  |  | 0.0 |
Total |  | $ | 2,760 |  |  |  |  |
Restricted stock units activity | RSU activity is presented below (number of RSUs in thousands):
|  | Years ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | Number of RSUs |  |  | Weighted Average Grant-date Fair Value |  |  | Number of RSUs |  |  | Weighted Average Grant-date Fair Value |  |  | Number of RSUs |  |  | Weighted Average Grant-date Fair Value |
Outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 842 |  |  | $ | 17.93 |  |  |  | 904 |  |  | $ | 14.77 |  |  |  | 986 |  |  | $ | 13.34 |
Granted |  |  | 272 |  |  |  | 18.30 |  |  |  | 314 |  |  |  | 19.85 |  |  |  | 252 |  |  |  | 18.90 |
Vested* |  |  | (308 | ) |  |  | 15.70 |  |  |  | (361 | ) |  |  | 11.70 |  |  |  | (334 | ) |  |  | 13.67 |
Cancelled or forfeited |  |  | (13 | ) |  |  | 19.06 |  |  |  | (15 | ) |  |  | 17.71 |  |  |  | - |  |  |  | - |
End of year |  |  | 793 |  |  | $ | 18.90 |  |  |  | 842 |  |  | $ | 17.93 |  |  |  | 904 |  |  | $ | 14.77 |
Expected to vest |  |  | 793 |  |  |  |  |  |  |  | 842 |  |  |  |  |  |  |  | 904 |  |  |  |  |
* The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements.
RSUs with performance-based vesting criteria | The number of performance-based RSUs scheduled to vest increases ratably based on the achievement of defined performance criteria between the established target and maximum levels. RSUs with performance-based vesting criteria are expected to vest as follows (number of RSUs in thousands):
Vesting Date |  | Expected to Vest |  |  | Not Expected to Vest |  |  | Total |
January 1, 2021** |  |  | 141 |  |  |  | - |  |  |  | 141 |
January 1, 2022 |  |  | 174 |  |  |  | - |  |  |  | 174 |
January 1, 2023 |  |  | 152 |  |  |  | - |  |  |  | 152 |
** The performance vesting criteria for the performance-based RSUs with a vesting date of January 1, 2021 were achieved.
Phantom stock units activity under the 2007 Program | The following table summarizes the Company’s phantom stock units activity (number of phantom stock units in thousands):
|  | Years ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | Number of Phantom Stock Units |  |  | Grant-date Fair Value per Unit |  |  | Number of Phantom Stock Units |  |  | Grant-date Fair Value per Unit |  |  | Number of Phantom Stock Units |  |  | Grant-date Fair Value per Unit |
Outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 183 |  |  |  |  |  |  | 170 |  |  |  |  |  |  | 157 |  |  |  |
Granted |  |  | 10 |  |  | $ | 21.49 |  |  |  | 10 |  |  | $ | 17.72 |  |  |  | 10 |  |  | $ | 21.35 |
Dividend equivalents issued |  |  | 5 |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  | 3 |  |  |  |  |
End of year |  |  | 198 |  |  |  |  |  |  |  | 183 |  |  |  |  |  |  |  | 170 |  |  |  |  |

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