Derivative Financial Instruments - Schedule of LIBOR interest rate caps (Details) - USD ($)	Dec. 31, 2019	May 15, 2019	Dec. 31, 2018	Dec. 11, 2018	Jul. 16, 2018	Mar. 07, 2018	Nov. 28, 2017	Sep. 18, 2017	Jun. 23, 2017	Feb. 07, 2017	Jun. 17, 2016	Feb. 25, 2016	Oct. 26, 2015
Derivative [Line Items]
Notional Amount	$ 496,642,000		$ 513,208,000
LIBOR | Interest rate caps
Derivative [Line Items]
Notional Amount		$ 100,000,000		$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 70,000,000	$ 75,000,000	$ 75,000,000
Strike Rate		2.50%		2.75%	2.50%	2.25%	1.50%	1.50%	1.50%	1.50%	1.00%	1.50%	1.25%
Premium Paid	$ 2,370,000	$ 288,000		$ 210,000	$ 319,000	$ 310,000	$ 359,000	$ 199,000	$ 154,000	$ 187,000	$ 150,000	$ 57,000	$ 137,000