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Other Intangible Asset - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Intangible Assets        
Intangibles amortization $ 2,868 $ 2,997 $ 8,605 $ 8,532
Estimated amortization expense for the next five years        
2018 2,869   2,869  
2019 10,954   10,954  
2020 10,932   10,932  
2021 10,670   10,670  
2022 $ 10,520   10,520  
2023     $ 10,520