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Customer Leases, as Lessor (Future Minimum Lease Payments to be Received Under Non-Cancelable Operating Customer Leases) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Leases [Abstract]  
2017 $ 311,946
2018 229,567
2019 149,144
2020 102,917
2021 85,467
Thereafter 117,216
Total $ 996,257