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Debt - First Lien Facility (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 08, 2017
Mar. 30, 2016
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Basis spread on variable rate   4.00%      
Repayments of long-term debt       $ 13,021,000  
First Lien Lenders | First Lien Facility          
Debt Instrument [Line Items]          
Term loan, amount   $ 201,468,750      
Repayments of long-term debt $ 171,078,000       $ 5,651,000
First Lien Lenders | First Lien Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Revolving credit facility amount   $ 50,000,000      
Repayments of lines of credit $ 20,000,000   $ 5,000,000