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Leases (Future Minimum Annual Lease Payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Leases, Operating [Abstract]  
2017 $ 12,609
2018 10,262
2019 7,907
2020 5,610
2021 4,016
Thereafter 25,362
Total minimum operating lease payments $ 65,766