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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Number and Cost of Common Stock Shares Repurchased The number and the cost of common stock shares repurchased during the years ended December 31, 2021, 2020 and 2019, are reflected in the following table (in thousands):
 Year Ended December 31,
 202120202019
Common stock repurchased (in shares)2,796 2,505 4,253 
Common stock repurchased$260,410 $138,408 $250,154 
Number and Cost of Employee Stock Plan Repurchases The number and the cost of employee stock plan repurchases made during the years ended December 31, 2021, 2020 and 2019, are reflected in the following table (in thousands):
 Year Ended December 31,
 202120202019
Repurchases related to employee stock plans (in shares)347 366 352 
Repurchases related to employee stock plans$29,817 $17,399 $22,491