Business Overview and Summary of Significant Accounting Policies - Operating and Financing Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Leases
Operating lease right-to-use assets, net of amortization	$ 7,271
Operating lease right-to-use assets	7,271
Operating lease liability (current)	2,104
Long-term operating liability	6,285
Total	8,389
Property, equipment and leasehold improvements	82,730	$ 92,856
Accumulated depreciation	(44,486)	(53,746)
Plant, equipment and leasehold improvements, net	45,515	$ 39,110
Financing lease liability	1,725
Long-term financing liability	2,525
Total	4,250
Financing leases
Leases
Property, equipment and leasehold improvements	5,178
Accumulated depreciation	(512)
Plant, equipment and leasehold improvements, net	$ 4,666