Leases Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases:
Operating lease right-of-use asset	$ 18,876	$ 18,900	$ 0
Current operating lease liability	6,139
Operating lease liability - less current portion	13,782
Total operating lease liability	19,921	19,900
Finance leases:
Property and equipment, at cost	1,692
Accumulated depreciation	(839)
Property and equipment, net	853	900
Current finance lease liability	307
Finance lease liability - less current portion	581
Total finance lease liability	$ 888	$ 900
Weighted Average Remaining Lease Term:
Operating leases	4 years 9 months 18 days
Finance leases	3 years
Weighted Average Discount Rate:
Operating leases	5.18%
Finance leases	5.06%