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Stockholder's Equity (Tables)
 9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Treasury Stock Activity The following represents the activity relating to the treasury stock held by the Company during the nine months ended September 30, 2021:
Treasury Stock SharesCost
(dollars in thousands)		Average Cost per Share
Balance outstanding at December 31, 202022,619,863 $346,870 $15.33 
Shares purchased for minimum tax withholding under the 2010 and 2020 Equity Plans or other similar transactions648,047 26,078 40.24 
Shares of stock received in respect of indemnification claims1,155 29 25.33 
Purchase of treasury stock3,336,815 122,945 36.84 
Balance outstanding at September 30, 202126,605,880 $495,922 $18.64