Leases - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Sublease, remaining lease term	1 year 1 month 6 days
Sublease income	$ 707,000	$ 0
Lease not yet commenced, undiscounted amount	$ 13,400,000
Weighted average remaining lease term	3 years 3 months 18 days
Operating lease, weighted average discount rate, percent	3.20%
Rent expense		$ 2,600,000
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	4 years 9 months 18 days
Lease not yet commenced, term of contract	4 years
Co-location Asset Lease | Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	4 years 10 months 24 days