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Employee Stock Purchase and Equity-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Stock Issuance Activity | The following table presents stock issuance activity for the year ended December 31, 2020 (in thousands):
|  | 2020 |
Purchase price paid for shares sold |  | $ | 4,386 |
Number of shares sold |  |  | 127 |
Schedule of Amount Paid for Cash Settled Awards by Award Type | The following table presents the amount paid for cash settled awards, by award type, for the years ended December 31, 2020, December 31, 2019, and December 31, 2018 (in thousands):
|  | December 31, 2020 |  |  | December 31, 2019 |  |  | December 31, 2018 |
Stock Appreciation Rights |  | $ | 26,920 |  |  | $ | 5,261 |  |  | $ | 4,576 |
Long-Term Growth |  |  | 3,617 |  |  |  | 1,108 |  |  |  | 1,095 |
Restricted Award Units |  |  | 9,408 |  |  |  | 5,537 |  |  |  | 4,439 |
Total |  | $ | 39,945 |  |  | $ | 11,906 |  |  | $ | 10,110 |
Summary of Restricted Stock Outstanding | For the year ended December 31, 2020, 78,476 shares of restricted stock units were issued, and 36,921 shares of common stock related to employee statutory income tax withholding were retired. For the year ended December 31, 2019, 74,704 shares of restricted stock units were issued, and 27,962 shares of common stock related to employee statutory income tax withholding were retired. The following table presents the number of shares of restricted stock outstanding (at target shares for awards with performance conditions) at December 31, 2020 and December 31, 2019:
|  | December 31, 2020 |  |  | Weighted Average Grant-Date Fair Value |  |  | December 31, 2019 |  |  | Weighted Average Grant-Date Fair Value |
Restricted Stock Units (service condition) |  |  | 374,819 |  |  | $ | 36.68 |  |  |  | 189,090 |  |  | $ | 34.15 |
Restricted Stock Units (service and performance condition) |  |  | 556,966 |  |  | $ | 36.07 |  |  |  | 317,550 |  |  | $ | 34.02 |
Stock Appreciation Rights |
Summary of Stock Appreciation Right Activity | The following table presents the number of SARs granted, vested, and forfeited for the years ended December 31, 2018, December 31, 2019, and December 31, 2020:
| Number of Units |  |  | Weighted Average Grant-Date Fair Value |
Unvested at December 29, 2017 |  | 3,395,375 |  |  | $ | 3.00 |
Granted |  | 1,708,746 |  |  | $ | 3.00 |
Vested |  | (1,322,805 | ) |  | $ | 3.00 |
Forfeited |  | (364,662 | ) |  | $ | 3.00 |
Unvested at December 31, 2018 |  | 3,416,654 |  |  | $ | 3.00 |
Granted |  | - |  |  | $ | - |
Vested |  | (1,547,142 | ) |  | $ | 3.00 |
Forfeited |  | (391,884 | ) |  | $ | 3.00 |
Unvested at December 31, 2019 |  | 1,477,628 |  |  | $ | 3.00 |
Granted |  | - |  |  | $ | - |
Vested |  | (1,434,836 | ) |  | $ | 3.00 |
Forfeited |  | (42,792 | ) |  | $ | 3.00 |
Unvested at December 31, 2020 |  | - |  |  | $ | - |
Long-Term Growth Units |
Schedule of Unvested Share Activity | The following table presents the number of Long-Term Growth Units granted, vested, and forfeited (at target shares) for the years ended December 31, 2020, December 31, 2019, and December 31, 2018:
| Number of Units |  |  | Weighted Average Grant-Date Fair Value |
Unvested at December 29, 2017 |  | 307,881 |  |  | $ | 20.18 |
Granted |  | 144,777 |  |  | $ | 22.67 |
Vested |  | (136,221 | ) |  | $ | 20.00 |
Forfeited |  | (16,656 | ) |  | $ | 20.27 |
Unvested at December 31, 2018 |  | 299,781 |  |  | $ | 20.23 |
Granted |  | - |  |  | $ | - |
Vested |  | (137,760 | ) |  | $ | 20.00 |
Forfeited |  | (34,584 | ) |  | $ | 20.27 |
Unvested at December 31, 2019 |  | 127,437 |  |  | $ | 20.23 |
Granted |  | - |  |  | $ | - |
Vested |  | (125,948 | ) |  | $ | 22.67 |
Forfeited |  | (1,489 | ) |  | $ | 22.67 |
Unvested at December 31, 2020 |  | - |  |  | $ | - |
Restricted Award Units |
Summary of Restricted Stock Unit Activity | The following table presents the number of Restricted Award Units granted, vested, and forfeited for the years ended December 31, 2020, December 31, 2019, and December 31, 2018:
| Number of Units |  |  | Weighted Average Grant-Date Fair Value |
Unvested at December 29, 2017 |  | 659,445 |  |  | $ | 20.14 |
Granted |  | 262,140 |  |  | $ | 22.67 |
Vested |  | (264,408 | ) |  | $ | 20.00 |
Forfeited |  | (67,827 | ) |  | $ | 20.34 |
Unvested at December 31, 2018 |  | 589,350 |  |  | $ | 21.31 |
Granted |  | - |  |  | $ | - |
Vested |  | (281,805 | ) |  | $ | 20.33 |
Forfeited |  | (58,101 | ) |  | $ | 21.31 |
Unvested at December 31, 2019 |  | 249,444 |  |  | $ | 22.40 |
Granted |  | - |  |  | $ | - |
Vested |  | (234,028 | ) |  | $ | 22.38 |
Forfeited |  | (9,017 | ) |  | $ | 22.67 |
Unvested at December 31, 2020 |  | 6,399 |  |  | $ | 22.67 |
Restricted Stock Units |
Summary of Restricted Stock Unit Activity | The following table presents the number and weighted average grant-date fair value of restricted stock units (at target shares for awards with performance conditions) for the years ended December 31, 2020 and December 31, 2019:
|  | Number of Units |  |  | Weighted Average Grant-Date Fair Value |
Outstanding at December 31, 2018 |  |  | - |  |  | $ | - |
Granted |  |  | 598,219 |  |  |  | 34.06 |
Vested |  |  | (74,704 | ) |  |  | 34.02 |
Forfeited |  |  | (16,875 | ) |  |  | 34.02 |
Outstanding at December 31, 2019 |  |  | 506,640 |  |  | $ | 34.07 |
Granted |  |  | 583,445 |  |  |  | 37.92 |
Vested |  |  | (104,016 | ) |  |  | 34.34 |
Forfeited |  |  | (54,284 | ) |  |  | 35.54 |
Outstanding at December 31, 2020 |  |  | 425,145 |  |  | $ | 36.32 |
Summary of Restricted Stock Outstanding | The following table presents the number of shares of restricted stock units granted (at target shares for awards with performance conditions) for the years ended December 31, 2020 and December 31, 2019:
|  | December 31, 2020 |  |  | Weighted Average Grant-Date Fair Value |  |  | December 31, 2019 |  |  | Weighted Average Grant-Date Fair Value |
Restricted Stock Units (service condition) |  |  | 313,735 |  |  | $ | 37.50 |  |  |  | 270,544 |  |  | $ | 34.11 |
Restricted Stock Units (service and performance condition) |  |  | 269,710 |  |  | $ | 38.43 |  |  |  | 327,675 |  |  | $ | 34.02 |

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