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Business Combinations (Details) - Business Combination Contingent Consideration by Earnout Target Period [Domain] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 28, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Business combinations            
Operating income   $ 7,949 $ 27,981 $ 12,194 $ 48,026  
Goodwill   124,562   124,562   $ 119,410
Aevenia            
Business combinations            
Fair value of consideration $ 22,700          
Cash payment made 22,300          
Payable to sellers $ 400          
Current assets   4,200   4,200    
Current liabilities   2,100   2,100    
Plant and equipment   11,200   11,200    
Intangibles assets   3,850   3,850    
Goodwill   5,150   $ 5,150    
Goodwill and other intangible assets deductible for income tax purposes 15 years          
Business Combination Adjustments            
Increase to current assets   200        
Decrease to current liabilities   (200)        
Increase to intangible assets   3,850        
Decrease to goodwill   $ (4,200)        
Aevenia | Customer relationships            
Business combinations            
Intangibles assets $ 2,500          
Aevenia | Non-compete agreements            
Business combinations            
Intangibles assets $ 1,350