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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Additional Information Concerning Restricted Stock Units
The following table summarizes additional information concerning restricted stock units at December 31, 2021:
Restricted Stock UnitsWeighted Average Grant Date Fair Value Per Unit
Unvested as of December 31, 20201,815,415 $17.73 
Granted877,501 15.55 
Vested(863,827)18.46 
Dividends reinvested177,266 17.70 
Cancelled/forfeited(349,811)16.60 
Unvested as of December 31, 20211,656,544 $16.43 
Summary of Assumptions Used in Total Stockholder Return-Based Stock Units Valuation The following are the key assumptions used in this valuation:
202120202019
Risk free interest rate
0.17% - 0.99%
0.17% - 1.63%
1.57% - 2.54%
Expected stock price volatility
53.17% - 53.60%
23.80% - 53.17%
23.80% - 28.57%
Expected service period
3.0 years
2.7 - 3.0 years
2.4 - 3.0 years
Expected dividend yield (assuming full reinvestment)— %— %— %