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Acquisitions - Acquisition of Unaflex LLC (Details) - USD ($)
 2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 14, 2017
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Acquisition transaction costs       $ 5,002,000  
Goodwill   $ 264,840,000 $ 264,840,000 $ 264,840,000 $ 151,455,000
Unaflex, LLC [Member]          
Business Acquisition [Line Items]          
Cash Paid to Seller Borrowed Under the Revolving Credit Facility $ 31,274,000        
Revenues reported by acquired entity         $ 17,494,000
Goodwill $ 15,277,000        
Revenues from the date of acquisition   2,522,000      
Operating loss from the date of acquisition   $ 36,000      
Amortization expense     $ 106,000