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EQUITY - Common Stock (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 11, 2019
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax withholding obligations incurred on behalf of employees     $ 900,000 $ 1,300,000
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued upon vesting (in shares)     164,224  
ATM Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate gross proceeds possible from sales of common stock under equity distribution agreement (up to) $ 400,000,000.0      
Shares sold under the ATM Program (in shares)   1,400,000 1,600,000  
Sale of stock, average price per share (in dollars per share)   $ 15.70 $ 16.26  
Gross proceeds from issuance of common stock   $ 21,400,000 $ 25,300,000  
Payments for stock issuance commissions   300,000 400,000  
Amount available under ATM Program   $ 314,700,000 $ 314,700,000