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Stockholders' Equity (Details) - USD ($)
1 Months Ended
Aug. 31, 2019
May 31, 2019
Sep. 30, 2020
Jan. 02, 2020
Dec. 31, 2019
May 31, 2017
Class of Stock [Line Items]            
Share repurchase program authorized amount           $ 150,000,000
Stock repurchased during period, value   $ 100,000,000        
Treasury stock acquired (in shares) 2,100,000          
Shares repurchased, average cost per share (in usd per share) $ 48.26          
Stock repurchase program, remaining authorized repurchase amount     $ 50,000,000      
Common stock, shares issued (in shares)     53,459,000   51,807,000  
Private Placement | Common Class A | Walmart Program Agreement            
Class of Stock [Line Items]            
Common stock, shares issued (in shares)       975,000    
Common stock, shares issued and unvested (in shares)     731,253