Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	7 years 4 months
Operating lease right of use assets	$ 19,600
Operating lease liabilities	$ 27,797
Incremental borrowing rate	4.91%
Lease cost	$ 1,300	$ 1,700
Operating cash flows from operating leases	$ 1,100
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	1 year 3 months
Term of options to extend	3 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining initial lease terms	11 years 1 month
Term of options to extend	15 years