Leases Lease expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months			$ 1,140
Operating Lease, Payments	$ 215	$ 285
Operating Lease, Expense	233	285
Short-term Lease, Cost	25	12
Lease, Cost	258	$ 297
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 2,111
Operating Leases, Future Minimum Payments, Due in Two Years			1,003
Operating Leases, Future Minimum Payments, Due in Three Years			559
Operating Leases, Future Minimum Payments, Due in Four Years			0
Operating Leases, Future Minimum Payments, Due in Five Years			0
Operating Leases, Future Minimum Payments, Due Thereafter			0
Operating Leases, Future Minimum Payments Due			$ 2,702