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Equity-Based Compensation - Nonvested Shares Under Director Stock Plan and Equity Incentive Plan (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares [Roll Forward]      
Nonvested shares at beginning period (shares) 12,734,170    
Granted (shares) 6,007,501    
Vested (shares) (10,786,571)    
Forfeited (shares) (305,927)    
Nonvested shares at period end (shares) 7,649,173 12,734,170  
Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested shares at beginning period (USD per share) $ 14.53    
Granted (USD per share) 6.19    
Vested (USD per share) 14.27    
Forfeited (USD per share) 11.42    
Nonvested shares at period end (USD per share) $ 9.39 $ 14.53  
Restricted Stock      
Number of Shares [Roll Forward]      
Nonvested shares at beginning period (shares) 9,149,516    
Granted (shares) 3,605,137    
Vested (shares) (7,121,545)    
Forfeited (shares) (211,018)    
Nonvested shares at period end (shares) 5,422,090 9,149,516  
LTIP Units      
Number of Shares [Roll Forward]      
Nonvested shares at beginning period (shares) 3,506,387    
Granted (shares) 0    
Vested (shares) (3,506,387)    
Forfeited (shares) 0    
Nonvested shares at period end (shares) 0 3,506,387  
DSUs      
Number of Shares [Roll Forward]      
Nonvested shares at beginning period (shares) 78,267    
Granted (shares) 263,506    
Vested (shares) (158,639)    
Forfeited (shares) 0    
Nonvested shares at period end (shares) 183,134 78,267  
PSUs      
Number of Shares [Roll Forward]      
Nonvested shares at beginning period (shares) 0    
Granted (shares) 2,138,858 0 0
Vested (shares) 0    
Forfeited (shares) (94,909)    
Nonvested shares at period end (shares) 2,043,949 0  
Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested shares at beginning period (USD per share) $ 0.00    
Granted (USD per share) 5.09    
Vested (USD per share) 0.00    
Forfeited (USD per share) 5.09    
Nonvested shares at period end (USD per share) $ 5.09 $ 0.00