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Goodwill and Other Intangible Assets (Finite-lived Intangible Assets Amortization Expense) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Remainder of 2018 $ 1,542    
2019 5,618    
2020 4,986    
2021 4,520    
2022 4,095    
Thereafter 4,745    
Other intangible assets, net $ 25,506 $ 30,130 $ 36,886