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Assets - Intangible Assets - Amortization (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Estimated annual amortization expense  
2018 $ 4,184
2019 16,554
2020 15,628
2021 12,506
2022 10,172
Thereafter 25,314
Net Amount, Definite-lived intangible assets $ 84,358