Leases Leases (Details) $ in Thousands		3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lease, Cost		$ 1,545
Operating Lease, Weighted Average Remaining Lease Term	4 years 2 months	4 years 2 months
Operating Lease, Weighted Average Discount Rate, Percent	5.07%	5.07%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 648	$ 648
Lessee, Operating Lease, Liability, Payments, Due Year Two	841	841
Lessee, Operating Lease, Liability, Payments, Due Year Three	358	358
Lessee, Operating Lease, Liability, Payments, Due Year Four	36	36
Lessee, Operating Lease, Liability, Payments, Due Year Five	38	38
Lessee, Operating Lease, Liability, Payments, Due after Year Five	363	363
Lessee, Operating Lease, Liability, Payments, Due	2,284	2,284
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(253)	(253)
Operating Lease, Liability	2,031	2,031
Operating Lease, Payments		203
Operating Lease, Payments, Use		8
Lease Operating Expense [Member]
Lessee, Lease, Description [Line Items]
Short-term Lease, Cost		1,335
Operating Lease, Cost		54
General and Administrative Expense [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Cost		$ 156
Property, Plant and Equipment [Member]
Lessee, Lease, Description [Line Items]
Short-term Lease, Cost	3,983
Operating Lease, Cost	8
Lease, Cost	$ 3,991