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Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
 2 Months Ended 3 Months Ended
Feb. 15, 2017
Mar. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Business Acquisition [Line Items]        
Sales     $ 221,026 $ 207,333
Payments to Acquire Property, Plant, and Equipment     $ 12,718 $ 7,974
Effective Income Tax Rate Reconciliation, Percent     39.50% 30.60%
Futura Industries [Member]        
Business Acquisition [Line Items]        
Business Combination Contract Price $ 92,000      
Business Combination, Consideration Transferred 87,000      
Business Combinations Amount Deposited in Escrow - Earnout 5,000      
Business Combination, Contingent Consideration, Asset, Current   $ 4,250 $ 4,250  
Business Combinations Purchase Price Allocated Net of Contingent Consideration $ 82,788      
Tax Recovery Life of Goodwill for Amortization     15 years  
Business Acquisition, Period Results Included in Combined Entity   40 days    
Line of Credit Facility, Interest Rate During Period     3.00%  
Percentage of outstanding equity interests acquired 100.00%      
Effective Income Tax Rate Reconciliation, Percent     39.10%  
Aluminum Extrusions        
Business Acquisition [Line Items]        
Income Loss From Ongoing Operations     $ 9,829 $ 7,499
Futura Industries [Member]        
Business Acquisition [Line Items]        
Sales   $ 8,300    
Income Loss From Ongoing Operations   900    
Cost of Services, Depreciation and Amortization   500    
Payments to Acquire Property, Plant, and Equipment   $ 400    
Customer Relationships [Member] | Futura Industries [Member]        
Business Acquisition [Line Items]        
Finite-Lived Intangible Asset, Useful Life     12 years  
Trade Names [Member] | Futura Industries [Member]        
Business Acquisition [Line Items]        
Finite-Lived Intangible Asset, Useful Life     13 years