The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Property, Plant and Equipment, Net - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Property, Plant and Equipment, Net
Property, plant and equipment, net	$ 325,970,000		$ 334,853,000
Fixed asset impairment and other	10,089,000	$ 0
Depreciation expense	7,600,000	$ 7,100,000
Foreign
Property, Plant and Equipment, Net
Property, plant and equipment, net	94,000,000.0		91,900,000
Construction in progress
Property, Plant and Equipment, Net
Property, plant and equipment, net	92,050,000		$ 97,863,000
India Manufacturing Facility
Property, Plant and Equipment, Net
Fixed asset impairment and other	$ 8,900,000