Leases - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description
Operating lease right of use assets	$ 13,116
Lease liability current	3,304
Operating lease liability, noncurrent	$ 9,812		$ 0
Lease renewal term	5 years
Lease termination period	1 year
Operating lease, weighted average lease term	6 years
Operating lease, weighted average discount rate (percent)	4.90%
Finance lease, weighted average lease term	1 year
Finance lease, weighted average discount rate (percent)	4.30%
Minimum
Lessee, Lease, Description
Lease term	1 year
Maximum
Lessee, Lease, Description
Lease term	9 years
ASU 2016-02
Lessee, Lease, Description
Operating lease right of use assets		$ 13,585
Lease liability current		3,322
Operating lease liability, noncurrent		$ 10,263