Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
Year 1	$ 6,159
Year 2	6,206
Year 3	5,942
Year 4	5,973
Year 5	5,823
Years thereafter	575,562
Total future minimum lease payments	605,665
Less amount representing interest	(499,801)
Total present value of minimum payments	105,864	$ 100,900
Finance Lease Liabilities, Payments, Due [Abstract]
Year 1	260
Year 2	260
Year 3	241
Year 4	232
Year 5	60
Years thereafter	609
Total future minimum lease payments	1,662
Less amount representing interest	(311)
Total present value of minimum payments	$ 1,351		$ 618