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Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]            
Intangible asset amortization $ 5,587 $ 5,587 $ 3,049 $ 17,520 $ 9,178  
Aggregate amortization expense 2019 18,700     18,700    
Aggregate amortization expense 2020 14,600     14,600    
Aggregate amortization expense 2021 10,800     10,800    
Aggregate amortization expense 2022 7,500     7,500    
Aggregate amortization expense 2023 $ 1,400     $ 1,400    
Scenario, Forecast            
Finite-Lived Intangible Assets [Line Items]            
Intangible asset amortization           $ 22,500