Leases - Maturities of Operating Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
2019 (remainder)	$ 7,658
2020	20,664
2021	20,591
2022	20,674
2023	20,961
Thereafter	128,164
Total lease payments	218,712
Less imputed interest	(55,977)
Present value of lease liabilities	$ 162,735