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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment, Net
Property, plant and equipment, net	$ 325,098,000		$ 325,098,000		$ 334,853,000
Fixed asset impairment and other		$ 0	10,227,000	$ 0
Depreciation expense	7,400,000	$ 7,000,000.0	15,100,000	$ 14,100,000
Foreign
Property, Plant and Equipment, Net
Property, plant and equipment, net	97,500,000		97,500,000		91,900,000
Construction in progress
Property, Plant and Equipment, Net
Property, plant and equipment, net	83,772,000		83,772,000		$ 97,863,000
India Manufacturing Facility
Property, Plant and Equipment, Net
Property, plant and equipment, net	56,800,000		56,800,000
Fixed asset impairment and other	$ 100,000		$ 9,000,000.0