Lease Commitments and Contingencies (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease expense	$ 3,935
Variable lease expense	803
Short-term lease expense	1,808
Sublease income	(244)
Total lease cost	$ 6,302
Weighted-average remaining lease term	6 years 2 months 12 days
Weighted-average discount rate	4.90%
Operating cash flows for operating leases	$ 4,113
Leased assets obtained in exchange for new operating lease liabilities (non-cash activity)	$ 1,131