Leases - Net Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Net lease costs	$ (3,036)	$ (3,963)	$ (6,122)	$ (8,148)
Variable lease costs	300	500	700	800
Other general and administrative
Lessee, Lease, Description [Line Items]
Operating lease costs	(4,573)	(4,979)	(9,193)	(10,171)
Other revenue
Lessee, Lease, Description [Line Items]
Sublease revenue	$ 1,537	$ 1,016	$ 3,071	$ 2,023