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LEASES - Maturity of Operating Lease Payments, Lessor (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
2019 (remaining six months ending December 31, 2019) $ 664,943 $ 1,159,851
2020 1,119,707 892,721
2021 861,960 646,008
2022 593,681 421,050
2023 387,060 249,255
Thereafter 389,575 203,632
Total undiscounted cash flows $ 4,016,926 $ 3,572,517