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Restricted Stock Units
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Restricted Stock Units Restricted Stock Units
    Pursuant to its stock incentive plan, the Company may issue restricted stock units ("RSUs") to employees of the Company and its subsidiaries. The RSUs generally vest three to five years from the award date and are subject to other vesting and forfeiture provisions contained in the award agreement. RSUs are expensed pro-ratably over the vesting period. RSU expenses were $11 million and $12 million for the three months ended March 31, 2022 and 2021 respectively. A summary of RSUs issued in the three months ended March 31, 2022 and 2021 follows:
($ in thousands)
UnitsFair Value
20221,660 $150 
2021885 $40