Leases - Operating Lease Liabilities Payments Due (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 1,678
Lessee, Operating Lease, Liability, Payments, Due Year Two	2,822
Lessee, Operating Lease, Liability, Payments, Due Year Three	2,526
Lessee, Operating Lease, Liability, Payments, Due Year Four	2,368
Lessee, Operating Lease, Liability, Payments, Due Year Five	2,256
Lessee, Operating Lease, Liability, Payments, Due after Year Five	5,881
Lessee, Operating Lease, Liability, Payments, Due	17,531
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(1,955)
Operating Lease, Liability	15,576	$ 0
Other Liabilities [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 15,576	$ 11,800