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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount   $ 221,662 $ 285,752  
Accumulated Amortization   (89,317) (90,841)  
Net Carrying Amount   132,345 194,911  
Definite-lived intangible asset impairment   $ 41,032 0 $ 0
License agreements        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Useful Lives (Years)   10 years 5 months 22 days    
Gross Carrying Amount   $ 4,497 4,418  
Accumulated Amortization   (3,623) (3,438)  
Net Carrying Amount   $ 874 980  
Leases        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Useful Lives (Years)   3 years    
Gross Carrying Amount   $ 796 2,065  
Accumulated Amortization   (534) (912)  
Net Carrying Amount   $ 262 1,153  
Trademarks        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Useful Lives (Years)   10 years 5 months 25 days    
Gross Carrying Amount   $ 15,464 24,185  
Accumulated Amortization   (6,184) (7,868)  
Net Carrying Amount   9,280 16,317  
Definite-lived intangible asset impairment $ 3,400      
Trademarks | Environmental Techniques        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets acquired   $ 100    
Non-competes        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Useful Lives (Years)   1 year 8 months 11 days    
Gross Carrying Amount   $ 1,197 1,308  
Accumulated Amortization   (1,048) (1,054)  
Net Carrying Amount   $ 149 254  
Customer relationships        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Useful Lives (Years)   9 years 11 months    
Gross Carrying Amount   $ 160,423 187,554  
Accumulated Amortization   (56,907) (53,830)  
Net Carrying Amount   103,516 133,724  
Definite-lived intangible asset impairment 20,800      
Customer relationships | Environmental Techniques        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets acquired   $ 1,700    
Patents and acquired technology        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Useful Lives (Years)   6 years 1 month 17 days    
Gross Carrying Amount   $ 39,285 66,222  
Accumulated Amortization   (21,021) (23,739)  
Net Carrying Amount   18,264 $ 42,483  
Definite-lived intangible asset impairment $ 16,800      
Finite-lived intangible assets, period increase (decrease)   $ 5,300