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EQUITY - Common Stock (Details) - USD ($)
6 Months Ended
Feb. 25, 2019
Jun. 30, 2019
Jun. 30, 2018
Mar. 21, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average price per share (in dollars per share)       $ 25.00
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)   114,185    
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)   11,100,000    
Average price per share (in dollars per share)   $ 19.59    
Gross proceeds from issuance of common stock   $ 217,300,000    
Payments for stock issuance commissions   3,300,000    
Amount available under ATM Program   $ 282,700,000