Leases Future Minimum Finance Lease Payments (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Future minimum lease payments under financing leases
Remainder of 2019	$ 468
2020	624
2021	624
2022	624
2023	45
2024 and thereafter	0
Total minimum lease payments	2,385
Less amount representing interest	(30)
Present value of net minimum financing lease payments	2,355
Less current installments of obligation under accrued other	611
Obligations under other long-term liabilities, excluding current installments	$ 1,744
Weighted-average remaining lease term - finance leases (years)	3 years 10 months 30 days
Weighted-average discount rate - finance leases	1.53%