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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands |  |  | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 17, 2015 segment | Jul. 09, 2014 $ / item | Jul. 09, 2014 USD ($) | Sep. 30, 2015 USD ($) segment | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jul. 09, 2014 USD ($) | Sep. 30, 2015 USD ($) $ / item | Dec. 31, 2014 USD ($)
Segment reporting |  |  |  |  |  |  |  |  |
Number of reportable segments | segment | 2 |  |  | 1 |  |  |  |  |
Number of operating segments | segment | 2 |  |  |  |  |  |  |  |
Vessels, net |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  | 25 years |
Depreciation expense |  |  |  |  | $ 19,172 | $ 17,221 |  | $ 56,869 |
Estimated scrap value (in dollars per lightweight ton) | $ / item |  |  |  |  |  |  |  | 310 |
Estimated life of average scrap value of steel |  |  |  |  |  |  |  | 15 years |
Decrease in depreciation expense |  |  |  |  | 805 | $ 735 |  | $ 2,388 |
Deferred revenue |  |  |  |  |  |  |  |  |
Accrual related to estimated customer claims |  |  |  | $ 505 | $ 505 |  |  | $ 505 | $ 662
Predecessor |  |  |  |  |  |  |  |  |
Vessels, net |  |  |  |  |  |  |  |  |
Depreciation expense |  |  | $ 3,039 |  |  |  | $ 71,756 |  |
Estimated scrap value (in dollars per lightweight ton) | $ / item |  | 245 |  |  |  |  |  |  |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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