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Business Combination - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Apr. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]        
Purchase price of acquisition   $ 0 $ 30,993  
Goodwill   $ 136,057   $ 136,057
Certified Thermoplastics Co., LLC        
Business Acquisition [Line Items]        
Percentage of outstanding common stock acquired 100.00%      
Purchase price of acquisition $ 30,700      
Payments to acquire business 30,800      
Total preliminary purchase price allocation 30,800      
Intangible assets 8,100      
Inventories 2,200      
Accounts receivable 1,500      
Property and equipment 600      
Cash 100      
Other current assets 100      
Total liabilities assumed 400      
Goodwill $ 18,600      
Useful life (in years) 10 years      
Certified Thermoplastics Co., LLC | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets $ 6,900      
Certified Thermoplastics Co., LLC | Trade names and trademarks        
Business Acquisition [Line Items]        
Intangible assets $ 1,200