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Deferred Charges and Other Assets, net - Schedule of estimated amortization of intangible assets for the next five years and thereafter (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
2019 $ 10,957
2020 8,260
2021 6,780
2022 5,111
2023 3,685
Thereafter 11,395
Allocated value net $ 46,188