Property, Plant and Equipment (Summary) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 232,516	$ 198,633
Accumulated depreciation	100,888	85,947
Property, plant and equipment, net	131,628	112,686
Depreciation	21,200	14,400	$ 9,900
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,990	7,841
Buildings, machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	201,690	180,519
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 20,836	$ 10,273