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Commitments and Contingencies (Future rental commitments under leases) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leases, Future Minimum Payments Due [Abstract]  
2018 $ 5,618
2019 4,293
2020 3,360
2021 2,494
2022 1,968
Thereafter 6,679
Total $ 24,412