Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
Year 1	$ 5,862
Year 2	6,029
Year 3	5,758
Year 4	5,746
Year 5	5,838
Years thereafter	577,002
Total future minimum lease payments	606,235
Less amount representing interest	(501,517)
Total present value of minimum payments	104,718	$ 100,900
Finance Lease Liabilities, Payments, Due [Abstract]
Year 1	244
Year 2	244
Year 3	229
Year 4	218
Year 5	118
Years thereafter	606
Total future minimum lease payments	1,659
Less amount representing interest	(322)
Total present value of minimum payments	$ 1,337		$ 618