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STOCKHOLDERS' EQUITY - Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 20, 2019
Mar. 06, 2018
Jan. 11, 2018
Dec. 18, 2017
Mar. 31, 2019
Mar. 31, 2018
Dividends Payable [Line Items]            
Payments of special dividends         $ 0 $ 1,575
Common Stock            
Dividends Payable [Line Items]            
Dividends per common share (in usd per share) $ 0.125 $ 0.12500        
Common Stock, Excluding Private Repurchase Participants            
Dividends Payable [Line Items]            
Dividends per common share (in usd per share)       $ 0.73    
Payments of special dividends     $ 1,575