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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Stockholders' Equity.  
Summary of share repurchase activity

Quarter ended June 30, 

Six months ended June 30, 

Cumulative

2021

    

2020

    

2021

    

2020

    

total (1)

(in thousands)

Shares of common stock repurchased

2,574

6,975

7,227

7,213

16,933

Cost of shares of common stock repurchased

$

154,920

$

237,162

$

443,439

$

241,283

$

795,866

(1)Amounts represent the total shares of common stock repurchased under the stock repurchase program from inception through June 30, 2021.