Derivative Financial Instruments - Schedule of Interest Rate Derivative Instruments (Details) - Interest Rate Cap [Member] - Cash Flow Hedging [Member] - Not Designated as Hedging Instrument [Member]	Dec. 31, 2018 USD ($) instrument	Dec. 31, 2017 USD ($) instrument
Derivative [Line Items]
Number of instruments | instrument	10	18
Notional Amount	$ 283,654,000	$ 458,655,000
Weighted Average Rate Cap	2.81%	2.89%
Fair Value	$ 117,678	$ 51,646
LIBOR [Member]
Derivative [Line Items]
Variable Rate	2.52%	1.56%