Leases - Balance Sheet Location (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating leases
Operating lease right of use assets	$ 13,235
Operating lease liability, current	3,334
Operating lease liability, noncurrent	9,901	$ 0
Total operating lease liabilities	13,235
Finance leases
Property, plant, and equipment	3,626
Accumulated amortization	(2,834)
Property, plant, and equipment - net	792
Finance lease liability, current	642
Finance lease liability, noncurrent	150
Total finance lease liabilities	$ 792