Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Sublease, remaining lease term			7 months 6 days
Sublease income	$ 694	$ 600	$ 2,111	$ 1,000
Lease not yet commenced, undiscounted amount	$ 15,100		$ 15,100
Lease not yet commenced, term of contract	3 years 2 months 12 days		3 years 2 months 12 days
Weighted average remaining lease term	3 years		3 years
Operating lease, weighted average discount rate, percent	3.40%		3.40%
Rent expense		$ 3,100		$ 8,500
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term			4 years 3 months 18 days
Maximum | Co-location Asset Lease
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term			5 years 9 months 18 days