Summary of Significant Accounting Policies (Details 5) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Interest Rate Caps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Trade date and borrowing date	May 29, 2018
Effective date	September 27, 2018
Termination date	May 31, 2023
Notional amount	$ 100,000,000
Fixed interest rate (plus spread)	2.50% until November 30, 2018, 2.75% December 1, 2018 until April 30, 2019, 3.00% May 1, 2019 until maturity
Variable interest rate	1 month LIBOR
Settlement	Monthly on last day of each month
Interest payment dates	Monthly on last day of each month
Reset dates	Last day of each month
Corporate Debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Trade date and borrowing date	Mar. 27, 2018
Effective date	Not applicable
Termination date	Mar. 27, 2025
Notional amount	$ 100,000,000
Fixed interest rate (plus spread)	Not applicable
Variable interest rate	1 month LIBOR + 3.50
Settlement	Monthly on last day of each month
Interest payment dates	Monthly
Reset dates	Last day of each month