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Customer Leases, as Lessor (Future Minimum Lease Payments to be Received Under Non-Cancelable Operating Customer Leases) (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
Leases [Abstract]  
2017 (July - December) $ 178,913
2018 286,430
2019 191,087
2020 130,792
2021 102,236
Thereafter 126,347
Total $ 1,015,805