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Acquisition of the New Business - Preliminary Purchase Price Allocations (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 12 Months Ended
Nov. 02, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets            
Goodwill   $ 66,316 $ 66,316 $ 66,316 $ 25,777 $ 26,197
Separately identifiable intangible assets            
Weighted-average estimated useful life       17 years 3 months 18 days 13 years 9 months 18 days  
Unpatented technology and know-how            
Separately identifiable intangible assets            
Weighted-average estimated useful life       20 years 20 years  
Customer relationships            
Separately identifiable intangible assets            
Weighted-average estimated useful life       18 years 10 months 24 days 15 years 10 months 24 days  
Activated Carbon and Filter Aid Business (New Business)            
Assets            
Cash and cash equivalents $ 3,826          
Receivables 10,077          
Inventories 20,895          
Other current assets 1,171          
Property, plant and equipment 67,697          
Intangibles 37,248          
Goodwill 42,844          
Other assets 179          
Total assets 183,937          
Liabilities            
Accounts payable and accrued liabilities 6,151          
Payroll and benefits payable 4,360          
Accrued income taxes 581          
Deferred income taxes - long term 7,406          
Accrued pension and other liabilities 8,014          
Total liabilities 26,512          
Net assets 157,425          
Cash paid for acquisition 157,425          
Step-up of inventory 2,100          
Amortization of inventory step-up   $ 1,500        
Deductible goodwill for tax purposes 0          
Contingent liabilities assumed            
Contingent liabilities related to AROs 1,900          
Acquisition costs            
Acquisition-related costs     $ 10,500      
Activated Carbon and Filter Aid Business (New Business) | Selling, general and administrative expense            
Acquisition costs            
Acquisition-related costs       $ 14,000    
Integration costs       $ 200    
Activated Carbon and Filter Aid Business (New Business) | Unpatented technology and know-how            
Separately identifiable intangible assets            
Finite-lived intangibles $ 14,200          
Weighted-average estimated useful life 20 years          
Activated Carbon and Filter Aid Business (New Business) | Customer relationships            
Separately identifiable intangible assets            
Finite-lived intangibles $ 15,700          
Weighted-average estimated useful life 20 years          
Activated Carbon and Filter Aid Business (New Business) | Trade names and trademarks            
Separately identifiable intangible assets            
Indefinite-lived intangible assets $ 7,300