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Business Combinations - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 23, 2018
Sep. 11, 2017
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2018
Business Acquisition [Line Items]              
Purchase price, net of cash acquired       $ 0 $ 59,798 $ 0  
Goodwill       136,057 $ 117,435    
Certified Thermoplastics Co., LLC              
Business Acquisition [Line Items]              
Equity interest acquired 100.00%           100.00%
Purchase price, net of cash acquired $ 30,700            
Gross purchase price 30,810            
Intangible assets 8,100            
Goodwill 18,622            
Cash 98            
Inventories 2,207            
Accounts receivable 1,517            
Property and equipment 603            
Other current assets 27            
Total liabilities assumed 364            
Lightning Diversion Systems, Inc.              
Business Acquisition [Line Items]              
Equity interest acquired   100.00% 100.00%        
Purchase price, net of cash acquired   $ 60,000 $ 60,000        
Gross purchase price   $ 62,000 62,000        
Intangible assets     22,400        
Goodwill     34,900        
Cash     2,200        
Inventories     1,700        
Accounts receivable     900        
Property and equipment     100        
Other current assets     100        
Total liabilities assumed     300        
Selling, General and Administrative Expenses              
Business Acquisition [Line Items]              
Acquisition related costs       $ 600      
Customer relationships              
Business Acquisition [Line Items]              
Estimated useful life of intangible assets (in years)       17 years      
Customer relationships | Certified Thermoplastics Co., LLC              
Business Acquisition [Line Items]              
Intangible assets $ 6,900            
Estimated useful life of intangible assets (in years) 10 years            
Customer relationships | Lightning Diversion Systems, Inc.              
Business Acquisition [Line Items]              
Intangible assets     $ 21,100        
Estimated useful life of intangible assets (in years)     15 years        
Trade Names              
Business Acquisition [Line Items]              
Estimated useful life of intangible assets (in years)       13 years      
Trade Names | Lightning Diversion Systems, Inc.              
Business Acquisition [Line Items]              
Intangible assets     $ 1,300        
Estimated useful life of intangible assets (in years)     15 years