Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Share Repurchase Program (Details)

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Stockholders' Equity Share Repurchase Program (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity [Abstract]            
Number of shares authorized to be repurchased under stock repurchase program (in shares) 37,500,000       37,500,000  
Number of shares repurchased and retired to date (in shares) 12,174,300       12,174,300  
Cost of shares repurchased and retired to date $ 201,500       $ 201,500  
Repurchase of common stock (in shares) 0   0   0 105,300
Repurchase of common stock $ 0   $ 0 $ 1,064 $ 0 $ 1,100
Issuance of stock, net of offering costs $ 93 $ 99 $ 95 $ 142