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Significant Accounting Policies (Estimated Future Annual Amortization Expense of Intangible Assets) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2020 $ 35,084
2021 22,793
2022 20,594
2023 16,327
2024 5,292
Thereafter 8,388
Total $ 108,478