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Commitments and Contingencies Commitments And Contingencies (Future minimum operating lease payments) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Years Ending December 31,  
Future minimum lease payments - 2019 $ 24,806
Future minimum lease payments - 2020 19,407
Future minimum lease payments - 2021 16,146
Future minimum lease payments - 2022 14,469
Future minimum lease payments - 2023 12,800
Future minimum lease payments - Thereafter 25,868
Future minimum lease payments - Total $ 113,496