Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Estimated Amortization Expense (Details)

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Intangible Assets - Estimated Amortization Expense (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remainder of 2018 $ 11,372
2019 11,732
2020 10,145
2021 5,432
2022 5,432
2023 - 2039 32,018
Estimated amortization expense $ 76,131