Acquisition - Additional Information (Details)	Oct. 01, 2018 USD ($) Employee t	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 151,918,000	$ 153,463,000
Intangible assets, net		89,886,000	$ 93,614,000
G P Business [Member]
Business Acquisition [Line Items]
Business acquisition purchase price	$ 186,000,000
Business acquisition, date of completion	Oct. 01, 2018
Post-closing purchase price adjustments	$ 2,000,000
Annual production capacity | t	32,000
Number of employees at manufacturing facility | Employee	220
Goodwill		75,349,000
Intangible assets, net		43,600,000
Goodwill deductible for tax purposes		$ 0