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STOCKHOLDERS' EQUITY - Share Repurchases (Details) - USD ($)
6 Months Ended
Jun. 12, 2017
Sep. 14, 2016
May 16, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity, Class of Treasury Stock [Line Items]          
Stock repurchased and retired       $ 576,000,000 $ 210,332,000
June 2017 Share Repurchase | Common Stock          
Equity, Class of Treasury Stock [Line Items]          
Stock repurchased and retired (in shares) 26,181,818        
Stock repurchased and retired $ 576,000,000        
Stock repurchased and retired (in usd per share) $ 22.00        
September 2016 Share Repurchase | Common Stock          
Equity, Class of Treasury Stock [Line Items]          
Stock repurchased and retired (in shares)   3,628,116      
Stock repurchased and retired   $ 79,819,000      
Stock repurchased and retired (in usd per share)   $ 22      
Cash Tender Offer          
Equity, Class of Treasury Stock [Line Items]          
Stock repurchase program, fees and expenses     $ 301,000    
Cash Tender Offer | Common Stock          
Equity, Class of Treasury Stock [Line Items]          
Stock repurchased and retired (in shares)     10,000,000    
Stock repurchased and retired     $ 210,000,000    
Stock repurchased and retired (in usd per share)     $ 21    
Number of shares authorized to be repurchased     10,000,000    
Percentage of stock repurchased     10.24%    
Urban Partners II, LLC | Cash Tender Offer | Common Stock          
Equity, Class of Treasury Stock [Line Items]          
Stock repurchased and retired     $ 208,140,000