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EQUITY - Common Stock (Details) - USD ($)
3 Months Ended
Feb. 25, 2019
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax withholding obligations incurred on behalf of employees   $ 1,300,000 $ 200,000
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued upon vesting (in shares)   113,071  
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) $ 500,000,000.0    
Commission rate (up to) 1.50%    
Shares sold under the ATM Program (in shares)   0  
Amount available under ATM Program   $ 500,000,000