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Stockholder's Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Treasury Stock Activity The following represents the activity relating to the treasury stock held by the Company during the year ended December 31, 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 transactions1,055,620 40,392 38.26 
Shares of stock received in respect of indemnification claims1,155 29 25.33 
Purchase of treasury stock4,371,291 159,821 36.56 
Balance outstanding at December 31, 202128,047,929 $547,112 $19.51