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Significant Accounting Policies (Estimated Future Annual Amortization Expense of Intangible Assets) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2018 $ 54,486
2019 35,213
2020 23,050
2021 9,061
2022 7,210
Thereafter 12,932
Total $ 141,952