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Customer Relationships and Other Intangibles, Net - Future Amortization Expense of Customer Relationships and Other Intangibles (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
October 1, 2018 through December 31, 2018 $ 2,766  
2019 8,907  
2020 8,150  
2021 7,410  
2022 6,746  
Thereafter 30,682  
Net $ 64,661 $ 70,807