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EQUITY (Common Stock) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Feb. 28, 2019
Dec. 31, 2018
Nov. 26, 2018
Class of Stock [Line Items]            
Repurchase program cost $ 0 $ 10,449,000        
Increase (Decrease) in Stockholders' Equity            
Balance - January 1, 2019     101,595,096      
Issuance of stock     7,000,000      
Stock option exercises     4,422,644      
Repurchases of stock     (400,000)      
Vesting of restricted stock awards     2,005,536      
Balance Outstanding - September 30, 2019 114,720,769   114,720,769      
AOG            
Increase (Decrease) in Stockholders' Equity            
Exchanges of AOG Units     97,493      
Class A common stock            
Class of Stock [Line Items]            
Common stock, par value (in dollars per share) $ 0.01   $ 0.01   $ 0.01 $ 0.01
Common stock, shares issued (in shares) 114,719,768   114,719,768   101,594,095  
Authorized amount       $ 150,000,000    
Repurchase program cost     $ 10,400,000      
Remaining available for repurchases of common stock $ 139,600,000   $ 139,600,000      
Increase (Decrease) in Stockholders' Equity            
Balance - January 1, 2019     101,594,095      
Issuance of stock     7,000,000      
Stock option exercises     4,422,644      
Repurchases of stock     (400,000)      
Vesting of restricted stock awards     2,005,536      
Balance Outstanding - September 30, 2019 114,719,768   114,719,768      
Class A common stock | AOG            
Increase (Decrease) in Stockholders' Equity            
Exchanges of AOG Units     97,493      
Class B common stock            
Class of Stock [Line Items]            
Common stock, par value (in dollars per share) $ 0.01   $ 0.01   $ 0.01 $ 0.01
Common stock, shares issued (in shares) 1,000   1,000   1,000 1,000
Increase (Decrease) in Stockholders' Equity            
Balance - January 1, 2019     1,000      
Issuance of stock     0      
Stock option exercises     0      
Repurchases of stock     0      
Vesting of restricted stock awards     0      
Balance Outstanding - September 30, 2019 1,000   1,000      
Class B common stock | AOG            
Increase (Decrease) in Stockholders' Equity            
Exchanges of AOG Units     0      
Class C common stock            
Class of Stock [Line Items]            
Common stock, par value (in dollars per share) $ 0.01   $ 0.01   $ 0.01 $ 0.01
Common stock, shares issued (in shares) 1   1   1  
Increase (Decrease) in Stockholders' Equity            
Balance - January 1, 2019     1      
Issuance of stock     0      
Stock option exercises     0      
Repurchases of stock     0      
Vesting of restricted stock awards     0      
Balance Outstanding - September 30, 2019 1   1      
Class C common stock | AOG            
Increase (Decrease) in Stockholders' Equity            
Exchanges of AOG Units     0