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Derivative Instruments (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Derivative [Line Items]        
Indebtedness, gross   $ 864,690,000   $ 766,964,000
Interest Rate Cap        
Derivative [Line Items]        
Indebtedness, gross   856,600,000    
Notional amount   $ 796,500,000    
Interest Rate Cap | Minimum [Member]        
Derivative [Line Items]        
Strike rate   2.00%    
Interest Rate Cap | Maximum [Member]        
Derivative [Line Items]        
Strike rate   5.43%    
Interest Rate Cap | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Notional amount $ 80,000,000 $ 568,500,000 $ 80,000,000  
Strike rate 5.78%   5.78%  
Cost of derivative $ 4,500 $ 319,000    
Interest Rate Cap | Not Designated as Hedging Instrument | Minimum [Member]        
Derivative [Line Items]        
Strike rate   3.00%    
Interest Rate Cap | Not Designated as Hedging Instrument | Maximum [Member]        
Derivative [Line Items]        
Strike rate   5.35%    
Interest Rate Floor        
Derivative [Line Items]        
Notional amount   $ 3,000,000,000    
Strike rate   (0.25%)    
Eurodollar Future        
Derivative [Line Items]        
Cost of derivative   $ 0 $ 124,000