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COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-Based Awards All share-based compensation awards, regardless of the form of payout upon vesting, are presented in the following table, which summarizes our stock-based award activity. For performance-based awards, the number of shares deemed to be issued per the table below reflects the number of units at target performance. Performance-based awards contain terms which dictate that the number of award units to be issued will vary based upon actual performance compared to the respective plan’s performance metrics, with the potential for certain awards to earn additional shares beyond target performance (number of units in thousands):
Restricted Stock Awards(1)
Performance Stock Awards(1)
Phantom Stock Units
Weighted-Average Grant-Date Fair Value(2)
Nonvested at January 1, 2019
269 66 332 $31.80 
Granted157 764 — 33.15 
Vested(65)— (256)31.08 
Forfeited(34)(3)(16)32.31 
Nonvested at December 31, 2019
327 827 60 33.00 
Granted146 86 — 32.82 
Vested(101)— (58)32.13 
Forfeited(23)(8)(2)33.00 
Nonvested at December 31, 2020
349 905 — 33.06 
Granted 663 131 — 27.55 
Vested(151)(62)— 32.52 
Forfeited(24)— — 29.35 
Nonvested at December 31, 2021
837 974 — $30.71 
(1)The maximum number of award units that could be issued under all outstanding grants was 2.0 million as of December 31, 2021. The number of award units expected to vest was 1.3 million as of December 31, 2021.
(2)Prior to our underwritten IPO, we engaged an independent third-party valuation advisory consulting firm to estimate the EVPS of our common stock on an annual basis. The weighted-average grant-date fair values calculated herein reflect the EVPS estimates prior to our underwritten IPO and Nasdaq closing stock prices subsequent to our IPO.