Leases - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Right-of-use assets	$ 17,866
Lease liabilities	$ 20,102
Weighted-average discount rate	3.90%
Weighted-average remaining lease term	4 years 7 months 6 days
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Right-of-use assets		$ 17,600
Lease liabilities		$ 21,000
Minimum
Lessee, Lease, Description [Line Items]
Lease terms	3 years
Maximum
Lessee, Lease, Description [Line Items]
Lease terms	5 years