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LEASES - Maturity of Operating Lease Payments, Lessor (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
2019 (excluding three months ended March 31, 2019) $ 936,560 $ 1,159,851
2020 1,008,773 892,721
2021 756,134 646,008
2022 507,429 421,050
2023 319,320 249,255
Thereafter 291,636 203,632
Total undiscounted cash flows $ 3,819,852 $ 3,572,517