Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) segment	Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Number of reportable segments | segment	1
Right of use asset	$ 27,106
Lease liability	27,855
Deferred rent written off	$ (749)
ASU 2016-02
Lessee, Lease, Description [Line Items]
Right of use asset		$ 28,400
Deferred Rent Credit		(2,400)
Lease liability		$ 28,400
Ground Lease 1
Lessee, Lease, Description [Line Items]
Discount rate (percent)		3.94%
Ground Lease 2
Lessee, Lease, Description [Line Items]
Discount rate (percent)		5.36%