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Acquisitions Acquistions (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 20, 2016
May 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Goodwill     $ 267,788 $ 264,416
Goodwill Recorded     267,788 $ 264,416
Houston, Texas and Madera, California [Member]        
Business Combination, Consideration Transferred [Abstract]        
Cash paid     12,350  
Deferred payments     3,500  
Purchase Price     15,850  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Current assets     182  
Property, plant & equipment     8,356  
Goodwill     3,372  
Intangible and other non-current assets     4,029  
Assumed liabilities     (89)  
Purchase Price     15,850  
Goodwill Recorded     3,372  
Liabilities and Debt Assumed     $ 89  
Houston [Member]        
Business Combination, Consideration Transferred [Abstract]        
Cash paid   $ 6,700    
Deferred payments   3,500    
Purchase Price   10,200    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Goodwill   800    
Assumed liabilities   (100)    
Assets Acquired (Excluding Goodwill)   9,500    
Goodwill Recorded   800    
Liabilities and Debt Assumed   $ 100    
Madera, California [Member]        
Business Combination, Consideration Transferred [Abstract]        
Cash paid $ 5,650      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Goodwill 2,500      
Assumed liabilities 0      
Assets Acquired (Excluding Goodwill) 3,100      
Goodwill Recorded 2,500      
Liabilities and Debt Assumed $ 0