Leases Schedule of Operating Lease Payments Due (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Schedule of Operating Lease Payments Due [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 4,556
Lessee, Operating Lease, Liability, Payments, Due Year Two	5,325
Lessee, Operating Lease, Liability, Payments, Due Year Three	4,610
Lessee, Operating Lease, Liability, Payments, Due Year Four	4,020
Lessee, Operating Lease, Liability, Payments, Due Year Five	2,769
Lessee, Operating Lease, Liability, Payments, Due after Year Five	1,797
Lessee, Operating Lease, Liability, Payments, Due	23,077
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(2,474)
Operating lease right-of-use assets	$ 20,603	$ 20,889	$ 0