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Commitments and Contingencies (Operating Leases) (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Future minimum annual rentals under non-cancelable operating leases  
2020 $ 11,849
2021 10,002
2022 7,882
2023 5,111
2024 1,130
Thereafter 3,646
Total $ 39,620