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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Amortization Expense for Finite-lived Intangible Assets
Estimated amortization expense for the next five fiscal years based on existing intangible assets, excluding deferred charges is as follows:
(in thousands)
 
2020
3,238

2021
3,051

2022
2,741

2023
1,200

2024
1,043

Thereafter
4,442