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Acquisition (Details) - Timco
3 Months Ended 9 Months Ended
Apr. 01, 2015
USD ($)
payment
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Business Acquisition [Line Items]          
Consideration $ 81,000,000        
Tax reimbursement 8,000,000        
Contingent consideration $ 20,000,000.0        
Number of separate payments | payment 2        
Amount of separate payments $ 10,000,000.0        
Fair value of contingent consideration   $ 7,000   $ 7,000  
Goodwill 4,900,000        
Acquired intangible assets $ 7,900,000        
Amortization expense for intangible assets   $ 500,000 $ 500,000 $ 1,400,000 $ 900,000