Leases - Supplemental Cash Flow (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flow from operating leases	$ 2,267
ROU assets obtained in exchange for lease obligations, operating leases	24,212
Reductions to ROU assets resulting from reductions to lease obligations, operating leases	$ 1,689
Weighted average remaining lease term, operating lease	4 years 2 months 12 days
Weighted average discount rate, operating lease	4.49%