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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Oct. 08, 2019
Apr. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Goodwill And Intangible Assets [Line Items]            
Goodwill     $ 170,917 $ 136,057    
Purchase price, net of cash acquired     0 0 $ 59,798  
Amortization expense of intangible asset     $ 11,400 10,700 $ 9,300  
Minimum            
Goodwill And Intangible Assets [Line Items]            
Acquired intangible assets amortization period     10 years      
Maximum            
Goodwill And Intangible Assets [Line Items]            
Acquired intangible assets amortization period     18 years      
Certified Thermoplastics Co., LLC            
Goodwill And Intangible Assets [Line Items]            
Goodwill   $ 18,600        
Equity interest acquired   100.00%       100.00%
Purchase price, net of cash acquired   $ 30,700        
Gross purchase price   $ 30,800        
Nobles Worldwide, Inc.            
Goodwill And Intangible Assets [Line Items]            
Goodwill $ 34,860          
Equity interest acquired 100.00%   100.00%      
Purchase price, net of cash acquired $ 77,000          
Gross purchase price $ 77,305          
Structural Systems            
Goodwill And Intangible Assets [Line Items]            
Goodwill     $ 53,482 $ 18,622    
Percentage of fair value in excess of carrying amount     85.00%