Leases - Lessee, Operating Lease, Liability, Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
For the remainder of 2019	$ 20,361
2020	28,352
2021	28,745
2022	29,646
2023	30,061
2024	30,495
Thereafter	1,037,252
Total undiscounted cash flows	1,204,912
Present value discount	(720,739)
Lease liabilities	484,173	$ 0
Farley Office and Retail Building
Operating Lease Liabilities, Payments Due [Abstract]
For the remainder of 2019	6,822
2020	10,402
2021	7,229
2022	7,444
2023	7,809
2024	8,330
Thereafter	$ 519,048