Leases - Leases under ASC 840 (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Leases [Abstract]
Gross Rents, 2018	$ 6,916
Gross Rents, 2019	27,781
Gross Rents, 2020	27,930
Gross Rents, 2021	27,103
Gross Rents, 2022	26,100
Gross Rents, Thereafter	273,997
Gross Rents, Total Lease Payments	389,827
Sublease Income, 2018	556
Sublease Income, 2019	2,196
Sublease Income, 2020	2,152
Sublease Income, 2021	2,086
Sublease Income, 2022	1,970
Sublease Income, Thereafter	8,707
Sublease Income, Total Lease Payments	17,667
Net Rents, 2018	6,360
Net Rents, 2019	25,585
Net Rents, 2020	25,778
Net Rents, 2021	25,017
Net Rents, 2022	24,130
Net Rents, Thereafter	265,290
Net Rents, Total Lease Payments	$ 372,160