Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Share Repurchase Program (Details)

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Stockholders' Equity Share Repurchase Program (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]      
Number of shares authorized to be repurchased under stock repurchase program (in shares) 37,500,000    
Number of shares repurchased and retired to date (in shares) 12,174,300    
Cost of shares repurchased and retired to date $ 201,500    
Repurchase of common stock (in shares) 105,300 1,500 0
Repurchase of common stock $ 1,064 $ 19 $ 0
Number of shares of stock issued during period (in shares)     0
Issuance of stock, net of offering costs     $ 0