Leases - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Right-of-use assets	$ 15,289
Lease liabilities	$ 17,313
Weighted-average discount rate	4.00%
Weighted-average remaining lease term	3 years 6 months
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