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Derivative Instruments - Narrative (Details)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 16, 2017
USD ($)
Derivative [Line Items]      
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months $ 47,621,000    
Not Designated as Hedging Instrument | Minimum      
Derivative [Line Items]      
Interest rate cap 3.00%    
Not Designated as Hedging Instrument | Maximum      
Derivative [Line Items]      
Interest rate cap 3.95%    
Interest rate swaps      
Derivative [Line Items]      
Posted collateral $ 0 $ 15,120,000  
Interest rate swaps | Designated as Hedging Instrument      
Derivative [Line Items]      
Fair value of swaps acquired in merger     $ 21,135,000
Interest rate caps | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Debt service coverage ratio 1.2