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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, 2015
USD ($)
Leases [Abstract]  
2016 $ 283,060
2017 212,656
2018 153,193
2019 102,661
2020 87,978
Thereafter 217,415
Total $ 1,056,963