Property and Equipment (Components of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Components of Property, Plant and Equipment
Property and equipment	$ 112,852	$ 105,117
Less accumulated depreciation	(39,019)	(30,426)
Property and equipment, net	73,833	74,691
Land
Components of Property, Plant and Equipment
Property and equipment	6,724	5,837
Buildings and leasehold improvements
Components of Property, Plant and Equipment
Property and equipment	43,899	42,986
Machinery and equipment
Components of Property, Plant and Equipment
Property and equipment	41,548	36,187
Fixed assets in progress
Components of Property, Plant and Equipment
Property and equipment	4,298	3,235
Furniture and fixtures
Components of Property, Plant and Equipment
Property and equipment	2,002	1,969
Transportation equipment
Components of Property, Plant and Equipment
Property and equipment	2,200	3,059
Computer equipment and software
Components of Property, Plant and Equipment
Property and equipment	$ 12,181	$ 11,844