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VESSELS AND EQUIPMENT, NET (Summary of Vessels and Equipment, Net) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ (60,392) | $ (55,298) |
Cost | Vessels and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, gross, beginning balance | 1,693,171 |  |
Depreciation | 0 |  |
Capital improvements | 12,623 |  |
Reclassification from investments in direct financing leases | 355,635 |  |
Transfer to assets held for sale | (5,500) |  |
Property, Plant and Equipment, gross, ending balance | 2,055,929 |  | $ 1,693,171
Accumulated Depreciation | Vessels and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated Depreciation | 492,381 |  | 452,473
Depreciation | (39,908) |  |
Capital improvements | 0 |  |
Reclassification from investments in direct financing leases | 0 |  |
Transfer to assets held for sale | 0 |  |
Vessels and Equipment, net | Vessels and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, net, beginning balance | 1,240,698 |  |
Depreciation | (39,908) |  |
Capital improvements | 12,623 |  |
Reclassification from investments in direct financing leases | 355,635 |  |
Transfer to assets held for sale | (5,500) |  |
Property, Plant and Equipment, net, ending balance | $ 1,563,548 |  | $ 1,240,698

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