Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Summary of Amortization Expense for Intangible Assets for Each of Next Five Years (Details)

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Intangible Assets - Summary of Amortization Expense for Intangible Assets for Each of Next Five Years (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2018 $ 19,372
2019 16,700
2020 15,975
2021 14,065
2022 13,631
2023 $ 12,463