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Build-to-Suit Lease (Future Minimum Lease Payments) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Future minimum rental commitments  
2019 $ 4,646
2020 4,772
2021 4,902
2022 5,035
2023 5,171
Thereafter 44,795
Financing Obligations - Total 69,321
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments 42,034
Lisle Illinois Campus [Member]  
Future minimum rental commitments  
Capital Leases, Future Minimum Payments, Interest Included in Payments (26,727)
Financing Obligation on Land Lease [Member] [Member] | Lisle Illinois Campus [Member]  
Future minimum rental commitments  
Imputed Accrued Land Lease Obligation $ (560)