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Financial Commitments (Future Minimum Rent Payments under Non-Cancelable Operating Leases) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Financial Commitments [Abstract]  
2018 $ 18,420
2019 12,424
2020 8,980
2021 6,240
2022 5,524
Thereafter 14,898
Subtotal 66,486
Less - Sublease rental agreements (2,291)
Total $ 64,195