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Commitments and Contingencies (Future Minimum Rental Commitments) (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Operating Leases, Future Minimum Payments Due, Next Twelve Months, Gross $ 28,008
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, due within (657)
2018 27,351
Operating Leases, Future Minimum Payments, Due in Two Years, Gross 27,401
Operating Leases, Future Minimum Payments Due, Future Min. Sublease Rentals, due in two years (660)
2019 26,741
Operating Leases, Future Minimum Payments, Due in Three Years, Gross 22,896
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, due in three years (239)
2020 22,657
Operating Leases, Future Minimum Payments, Due in Four Years, Gross 20,095
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, due in four years 0
2021 20,095
Operating Leases, Future Minimum Payments, Due in Five Years, Gross 18,470
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, due in five years 0
2022 18,470
Thereafter 12,345
Operating Leases, Income Statement, Sublease Revenue 0
Operating Leases, Future Minimum Payments Due, Gross Total 129,215
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals (1,556)
Operating Leases - Total $ 127,659