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EQUITY - Common Stock (Details) - USD ($)
3 Months Ended
Dec. 11, 2019
Mar. 31, 2020
Mar. 31, 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)   161,338  
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)   200,000  
Sale of stock, average price per share (in dollars per share)   $ 20.33  
Gross proceeds from issuance of common stock   $ 3,900,000  
Payments for stock issuance commissions   58,000  
Amount available under ATM Program   $ 336,100,000