Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Schedule of Expected Amortization Expense (Details)

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Intangible Assets - Schedule of Expected Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Expected annual amortization expense related to amortizable intangible assets    
Three months ending December 31, 2018 $ 6,750  
2019 26,060  
2020 23,580  
2021 22,170  
2022 18,533  
2023 17,511  
Thereafter 41,019  
Net Book Value $ 155,623 $ 172,582