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Restricted Stock Units
 9 Months Ended
Sep. 30, 2023
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 $36 million and $34 million for the nine months ended September 30, 2023 and 2022, respectively. A summary of RSUs issued in the nine months ended September 30, 2023 and 2022 follows:
($ in thousands)
UnitsFair Value
20231,092,130 $68,936 
20221,023,871 $67,345