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Stockholder's Equity (Tables)
3 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Treasury Stock Activity The following represents the activity relating to the treasury stock held by the Company during the three months ended March 31, 2022:
Treasury Stock SharesCost
(dollars in thousands)
Average Cost per Share
Balance outstanding at December 31, 202128,047,929 $547,112 $19.51 
Shares purchased for minimum tax withholding under the 2010 and 2020 Equity Plans or other similar transactions374,149 12,283 32.83 
Purchase of treasury stock798,302 24,140 30.24 
Balance outstanding at March 31, 202229,220,380 $583,535 $19.97