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Acquisitions - Intangibles (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Noncompete agreements    
Intangibles    
Amortization period   4 years
Henderson    
Intangibles    
Goodwill expected to be deductible $ 4,218  
Amortization period 8 years 4 months 24 days  
Henderson | Customer Relationships    
Intangibles    
Acquired intangible assets, finite lived $ 8,300  
Amortization period 15 years  
Henderson | Patents    
Intangibles    
Acquired intangible assets, finite lived $ 3,200  
Amortization period 10 years  
Henderson | Noncompete agreements    
Intangibles    
Acquired intangible assets, finite lived $ 2,090  
Amortization period 4 years  
Henderson | Backlog    
Intangibles    
Acquired intangible assets, finite lived $ 200  
Amortization period 6 months  
Henderson | Trademark    
Intangibles    
Acquired intangible assets, indefinite lived $ 3,600