Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	7 years 1 month 6 days		7 years 1 month 6 days
Operating lease right of use assets	$ 17,600		$ 17,600
Operating lease liabilities	$ 26,036		$ 26,036
Incremental borrowing rate	4.91%		4.91%
Lease cost	$ 1,300	$ 1,800	$ 3,900	$ 5,200
Operating cash flows from operating leases			$ 3,700
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019					$ 6,100
2020					6,500
2021					5,100
2022					3,900
2023					3,500
Thereafter					$ 12,900
Minimum
Lessee, Lease, Description [Line Items]
Remaining initial lease terms			9 months 18 days
Term of options to extend	3 years		3 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining initial lease terms			10 years 7 months 6 days
Term of options to extend	15 years		15 years