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Business Combination - Estimated Fair Value of Assets and Liabilities Acquired (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Apr. 23, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 136,051   $ 117,435
Certified Thermoplastics Co., LLC      
Business Acquisition [Line Items]      
Cash   $ 98  
Accounts receivable   1,517  
Inventories   2,500  
Other current assets   27  
Property and equipment   603  
Intangible assets   8,000  
Goodwill   18,616  
Total assets acquired   31,361  
Current liabilities   (270)  
Total liabilities assumed   (270)  
Total preliminary purchase price allocation   $ 31,091