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Customer Leases, as Lessor (Future Minimum Lease Payments to be Received Under Non-Cancelable Operating Customer Leases) (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Leases [Abstract]  
2017 (April - December) $ 250,976
2018 255,011
2019 166,749
2020 113,991
2021 92,528
Thereafter 121,202
Total $ 1,000,457