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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2022 $ / item | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2021 USD ($) | Dec. 31, 2021 $ / item
Vessels, net |  |  |  |  |  |
Estimated useful life |  |  |  | 25 years |  |
Depreciation and amortization | $ |  | $ 14,521 | $ 13,769 | $ 28,579 | $ 27,209 |
Estimated scrap value (in dollars per lightweight ton) | $ / item | 400 |  |  |  |  | 310
Estimated life of average scrap value of steel | 15 years |  |  |  |  |
Decrease in depreciation expense | $ |  | $ 1,159 |  | $ 2,304 |  |
Increase in basic net earnings per share |  | $ 0.03 |  | $ 0.06 |  |
Increase in diluted net earnings per share |  | 0.02 |  | 0.05 |  |
Basic net earnings per share if no change to estimated scrap value |  | 1.09 |  | 2.05 |  |
Diluted net earnings per share if no change to estimated scrap value |  | $ 1.08 |  | $ 2.02 |  |
Vessels |  |  |  |  |  |
Vessels, net |  |  |  |  |  |
Depreciation and amortization | $ |  | $ 12,411 | $ 12,045 | $ 24,595 | $ 23,814 |

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