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STOCKHOLDERS' EQUITY - NARRATIVE (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Oct. 22, 2014
Nov. 01, 2007
Equity, Class of Treasury Stock [Line Items]            
Repurchased shares, value $ 18,667,000   $ 30,642,000      
Stock Repurchase Program            
Equity, Class of Treasury Stock [Line Items]            
Stock repurchase program, authorized amount           $ 50,000,000.0
Stock repurchase program, additional authorized amount         $ 30,000,000.0  
Repurchased shares (in shares) 2,900,000 0 4,900,000 0    
Repurchased shares, value $ 18,700,000   $ 30,600,000      
Stock repurchase program, average cost (in dollars per share) $ 6.39   $ 6.21      
Stock repurchase program, remaining available repurchase amount $ 0   $ 0