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Operating Leases - Future Minimum Lease Payments for Non-Cancelable Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 38,298
2020 34,705
2021 30,903
2022 26,713
2023 24,262
Thereafter 141,662
Total 296,543
Future, non-cancelable sublease payments to be received $ 2,900