Right to Use Assets and Liabilities - Future Changes in the Right to Use Liabilities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) lease
Right to Use Liabilities
Scheduled derecognition of right to use liability due to reductions in the lease deposit to less than two months rent	$ 4,800
Number of month's rent the lease deposit is less than | lease	2
Right to Use Liabilities
Right to Use Liabilities
2018	$ 218
2019	486
2020	486
2021	487
2022	487
Thereafter	13,260
Total minimum lease payments	15,424
Amounts representing interest	(5,350)
Present value of net minimum right to use liability payments	$ 10,074