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Acquisitions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Payments to Acquire Businesses, Gross $ 5,307 $ 32,286
Revenue, Net 349,637 305,907
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 65 0
Goodwill, Acquired During Period 2,086  
Screw Products [Member]    
Business Acquisition [Line Items]    
Payments to Acquire Businesses, Gross 5,150  
Finite-Lived Customer Relationships, Gross 2,580  
Finite-Lived Trade Names, Gross 470  
Revenue, Net 600  
Goodwill, Acquired During Period $ 1,929  
Bolt [Member] [Member]    
Business Acquisition [Line Items]    
Payments to Acquire Businesses, Gross   32,286
Finite-Lived Customer Relationships, Gross   4,186
Finite-Lived Trade Names, Gross   7,241
Goodwill, Acquired During Period   $ 14,176
Trade Names [Member] | Screw Products [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life 15 years  
Trade Names [Member] | Bolt [Member] [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life 15 years  
Customer Relationships [Member] | Screw Products [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Customer Relationships [Member] | Bolt [Member] [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life 12 years