Fair Value Measurements and Derivative Instruments (Schedule of Interest Rate Swaps and Caps) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Wells Fargo [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Effective date	Nov. 01, 2017
Maturity date	Nov. 30, 2022
Notional amount	$ 25,723	$ 26,048
KeyBank Credit Facility [Member] | Interest Rate Cap 2.50% [Member]
Derivative [Line Items]
Effective date	Mar. 01, 2017
Maturity date	Mar. 01, 2019
Notional amount		$ 50,000
KeyBank Credit Facility [Member] | Interest Rate Cap 3.35% [Member]
Derivative [Line Items]
Effective date	Apr. 01, 2019
Maturity date	Oct. 01, 2020
Notional amount	$ 30,000
LIBOR [Member] | Wells Fargo [Member]
Derivative [Line Items]
Reference rate	30-day LIBOR
Basis spread	2.39%
LIBOR [Member] | KeyBank Credit Facility [Member] | Interest Rate Cap 2.50% [Member]
Derivative [Line Items]
Reference rate	30-day LIBOR
Basis spread	2.50%
LIBOR [Member] | KeyBank Credit Facility [Member] | Interest Rate Cap 3.35% [Member]
Derivative [Line Items]
Reference rate	30-day LIBOR
Basis spread	3.35%
Federal Funds Effective Swap Rate [Member] | Wells Fargo [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Reference rate	30-day LIBOR
Basis spread	2.053%