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LEASES - Maturity of Operating Lease Payments, Lessor (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
2019 (remaining three months ending December 31, 2019) $ 347,696 $ 1,159,851
2020 1,211,789 892,721
2021 952,610 646,008
2022 673,422 421,050
2023 447,920 249,255
Thereafter 491,477 203,632
Total undiscounted cash flows $ 4,124,914 $ 3,572,517