International Seaways (INSW) 10-K 31 Mar 17 2016 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Mar. 28, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	International Seaways, Inc.
Entity Central Index Key	1,679,049
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		29,202,714
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2,016
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 0

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 92,001	$ 308,858
Voyage receivables, including unbilled of $61,416 and $71,200	66,918	74,951
Other receivables	5,302	4,464
Inventories	1,338	3,396
Prepaid expenses and other current assets	5,350	5,067
Total Current Assets	170,909	396,736
Restricted cash - non current		8,989
Vessels and other property, less accumulated depreciation	1,100,050	1,240,411
Deferred drydock expenditures, net	30,557	37,075
Total Vessels, Deferred Drydock and Other Property	1,130,607	1,277,486
Investments in and advances to affiliated companies	358,681	344,891
Other assets	2,324	1,848
Total Assets	1,662,521	2,029,950
Current Liabilities:
Accounts payable, accrued expenses and other current liabilities	38,237	30,783
Payable to OSG	683	11,350
Current installments of long-term debt	6,183	6,284
Total Current Liabilities	45,103	48,417
Long-term debt	433,468	588,938
Other liabilities	4,438	8,809
Total Liabilities	483,009	646,164
Commitments and contingencies
Equity:
Common stock - 100,000,000 no par value shares authorized; 29,189,454 shares issued and outstanding	29,825	29,825
Paid-in additional capital	1,276,411	1,325,504
(Accumulated deficit)/retained earnings	(74,457)	92,581
Stockholders' equity before accumulated other comprehensive loss	1,231,779	1,447,910
Accumulated other comprehensive loss	(52,267)	(64,124)
Total Equity	1,179,512	1,383,786
Total Liabilities and Equity	$ 1,662,521	$ 2,029,950

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement Of Financial Position Parenthetical [Abstract]
Unbilled contracts receivable (in dollars)	$ 61,416	$ 71,200
Common stock, shares authorized	100,000,000	100,000,000
Common stock, no par value	$ 0	$ 0
Common stock, shares, issued	29,189,454	29,189,454
Common stock, shares, outstanding	29,189,454	29,189,454

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shipping Revenues:
Pool revenues, including $37,481 in 2016, $45,372 in 2015 and $85,967 in received from companies accounted for by the equity method	$ 246,196	$ 360,218	$ 180,813
Time and bareboat charter revenues	95,484	52,092	44,846
Voyage charter revenues	56,639	85,324	291,359
Shipping revenues	398,319	497,634	517,018
Operating Expenses:
Voyage expenses	13,274	21,844	170,031
Vessel expenses	141,944	143,925	133,772
Charter hire expenses	37,411	36,802	60,955
Depreciation and amortization	79,885	81,653	84,931
General and administrative	31,618	41,516	52,597
Severance costs			16,666
Separation and transition costs	9,043
Technical management transition costs		39	3,417
Loss/(gain) on disposal of vessels and other property, including impairments	79,203	(4,459)	(9,955)
Total Operating Expenses	392,378	321,320	512,414
Income from Vessel Operations	5,941	176,314	4,604
Equity in Income of Affiliated Companies	16,849	45,559	37,872
Operating Income	22,790	221,873	42,476
Other (Expense)/Income	(966)	66	(45)
Income before Interest Expense, Reorganization Items and Income Taxes	21,824	221,939	42,431
Interest Expense	(39,476)	(42,970)	(56,258)
Income/(Loss) before Reorganization Items and Income Taxes	(17,652)	178,969	(13,827)
Reorganization items, net	(131)	(5,659)	(104,528)
Income/(Loss) before Income Taxes	(17,783)	173,310	(118,355)
Income Tax Provision	(440)	(140)	(744)
Net Income/(Loss)	$ (18,223)	$ 173,170	$ (119,099)
Weighted Average Number of Common Shares Outstanding:
Basic and Diluted (in shares)	29,157,992	29,157,387	29,157,387
Per Share Amounts:
Basic and Diluted net income (in dollars per share)	$ (0.62)	$ 5.94	$ (4.08)

CONSOLIDATED STATEMENTS OF OPE5

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Pool revenues, received from companies accounted for by the equity method	$ 37,481	$ 45,372	$ 85,967

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net (loss)/income	$ (18,223)	$ 173,170	$ (119,099)
Other Comprehensive Income/(Loss), net of tax:
Net change in unrealized losses on cash flow hedges	13,129	7,910	(2,093)
Foreign currency translation adjustment	42	(13)	87
Defined benefit pension and other postretirement benefit plans:
Net change in unrecognized prior service costs	294	118	232
Net change in unrecognized actuarial losses	(1,608)	2,234	(4,974)
Other Comprehensive Income/(Loss)	11,857	10,249	(6,748)
Comprehensive Income/(Loss)	$ (6,366)	$ 183,419	$ (125,847)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net (loss)/income	$ (18,223)	$ 173,170	$ (119,099)
Items included in net (loss)/income not affecting cash flows:
Depreciation and amortization	79,885	81,653	84,931
Loss on write-down of vessels and other fixed assets	79,242
Amortization of debt discount and other deferred financing costs	6,643	5,835	2,009
Deferred financing costs write-off	5,097
Direct and allocated stock compensation, non-cash	2,841	2,811	571
Deferred income tax benefit			(10)
Undistributed earnings of affiliated companies	(17,816)	(38,666)	(32,549)
Allocated reorganization items, non-cash	131	5,659	87,197
Other - net	517	(41)	106
Items included in net income/(loss) related to investing and financing activities:
Gain on disposal of vessels and other property, net	(39)	(4,459)	(9,955)
Allocated general and administrative expenses recorded as capital contributions	1,146	954	3,359
Discount on repurchase of debt	(3,755)
Payments for drydocking	(9,258)	(20,728)	(12,078)
Bankruptcy claim payments			(285,322)
Deferred financing costs paid for loan modification	(8,273)	(5,545)
Changes in operating assets and liabilities:
Decrease in receivables	8,033	13,398	39,392
(Decrease)/increase in cost sharing reimbursement payable to OSG	(10,667)	5,733	(21,262)
Net change in inventory, prepaid expenses and other current assets, accounts payable, accrued expenses and other current and long-term liabilities	1,264	2,965	9,415
Net cash provided by/(used in) operating activities	116,768	222,739	(253,295)
Cash Flows from Investing Activities:
Decrease/(increase) in restricted cash	8,989	61,104	(70,093)
Expenditures for vessels and vessel improvements	(1,988)	(964)	(21,454)
Proceeds from disposal of vessels and other property		17,058	78,426
Expenditures for other property	(907)
Investments in and advances to affiliated companies	(987)	(153)
Repayments of advances from affiliated companies	18,500	37,500	29,722
Other - net		(382)	(240)
Net cash provided by investing activities	23,607	114,163	16,361
Cash Flows from Financing Activities:
Issuance of debt, net of issuance and deferred financing costs			605,561
Payments on debt, including adequate protection payments	(90,065)	(6,284)	(317,411)
Extinguishment of debt	(65,167)
Net change in investment of OSG			(53,225)
Dividend payments to OSG	(202,000)	(200,000)
Contributions by OSG			6,306
Net cash (used in)/provided by financing activities	(357,232)	(206,284)	241,231
Net (decrease)/increase in cash and cash equivalents	(216,857)	130,618	4,297
Cash and cash equivalents at beginning of year	308,858	178,240	173,943
Cash and cash equivalents at end of year	$ 92,001	$ 308,858	$ 178,240

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Paid-in Additional Capital [Member]	Retained Earnings / (Accumulated deficit) [Member]	Accumulated Other Comprehensive Loss [Member]	Parent Company [Member]	Total
Balance at Dec. 31, 2013				$ (67,625)	$ 1,036,467	$ 968,842
Net (Loss)/Income					(119,987)	(119,987)
Other comprehensive income (loss)				(984)		(984)
Net change in investment of Former Parent					507,068	507,068
Reclassification of net investment of Former	$ 29,825	$ 1,393,723			(1,423,548)
Balance at Jul. 31, 2014	29,825	1,393,723		(68,609)		1,354,939
Balance at Dec. 31, 2013				(67,625)	$ 1,036,467	968,842
Net (Loss)/Income						(119,099)
Other comprehensive income (loss)						(6,748)
Balance at Dec. 31, 2014	29,825	1,434,603	$ 888	(74,373)		1,390,943
Balance at Jul. 31, 2014	29,825	1,393,723		(68,609)		1,354,939
Net (Loss)/Income			888			888
Other comprehensive income (loss)				(5,764)		(5,764)
Capital contribution of Former Parent, net		40,880				40,880
Balance at Dec. 31, 2014	29,825	1,434,603	888	(74,373)		1,390,943
Net (Loss)/Income			173,170			173,170
Other comprehensive income (loss)				10,249		10,249
Capital contribution of Former Parent, net		9,424				9,424
Dividends		(118,523)	(81,477)			(200,000)
Balance at Dec. 31, 2015	29,825	1,325,504	92,581	(64,124)		1,383,786
Net (Loss)/Income			(18,223)			(18,223)
Other comprehensive income (loss)				11,857		11,857
Capital contribution of Former Parent, net		3,797				3,797
Dividends		(53,185)	(148,815)			(202,000)
Amortization of restricted stock awards		40				40
Amortization of restricted stock units		184				184
Compensation relating to stock options		71				71
Balance at Dec. 31, 2016	$ 29,825	$ 1,276,411	$ (74,457)	$ (52,267)		$ 1,179,512

BASIS OF PRESENTATION AND DESCR

BASIS OF PRESENTATION AND DESCRIPTION OF BUSINESS	12 Months Ended
	Dec. 31, 2016
Basis of Presentation [Abstract]
Basis of Presentation	NOTE 1 — DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION: Spin-Off from Overseas Shipholding Group, Inc . On November 30, 2016 (the “Distribution Date”), International Seaways, Inc. (“INSW”), a Marshall Islands corporation, and its wholly owned subsidiaries (the “Company” or “INSW”, or “we” or “us” or “our”), became a public entity as a result of its spin-off (the “Distribution”) from Overseas Shipholding Group, Inc. (“OSG”), a publicly traded company incorporated in Delaware (United States). The spin-off separated OSG and INSW into two distinct businesses with separate management. OSG retained the U.S. Flag business and INSW holds entities and other assets and liabilities that formed OSG’s former International Flag business. On November 30, 2016, we amended and restated our articles of incorporation (“Amended and Restated Articles of Incorporation”). In accordance with the Amended and Restated Articles of Incorporation, immediately prior to the distribution, as described in the following paragraph, the Company effected a stock split of its 102.21 issued and outstanding shares of common stock, which were all owned by OSG, to allow for a prorata dividend of such shares to the holders of OSG common stock and warrants. In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) ASC 260, Earnings Per Share , the Company adjusted the computations of basic and diluted earnings per share retroactively for all periods presented to reflect that change in its capital structure. Following the distribution our authorized capital stock consisted of 100,000,000 shares of common stock without par value and 10,000,000 shares of preferred stock without par value. The spin-off transaction was in the form of a pro rata dividend of 100 % of the common stock of INSW to holders of OSG common stock and warrants. Effective as of 5:00 p.m., New York time, on the Distribution Date (the “Effective Time”), our common stock was distributed, on a pro rata basis, to OSG’s stockholders and warrant holders of record as of 5:00 p.m., New York time, on November 18, 2016 (the “Record Date”). On the Distribution Date, each holder of OSG common stock received 0.3333 shares of our common stock for every share of OSG common stock held on the Record Date. Each holder of OSG warrants received 0.3333 shares of our common stock for every one share of OSG common stock they would have received if they exercised their warrants immediately prior to the Distribution (or 0.063327 INSW shares per warrant), treating such warrants on an as-exercised basis without deduction for the exercise price of such warrants. Fractional shares of our common stock were not distributed in the spin-off. Holders of OSG common stock and warrants received cash in lieu of fractional shares of our common stock. Our common stock began “regular-way” trading on the New York Stock Exchange on December 1, 2016, under the symbol “INSW.” The spin-off was completed pursuant to a separation and distribution agreement (the “Separation and Distribution Agreement”) and several other agreements with OSG related to the spin-off, including a transition services agreement (the “Transition Services Agreement”) and an employee matters agreement (the “Employee Matters Agreement”) dated November 30, 2016. These agreements govern the relationship between us and OSG following the spin-off and provide for the allocation of various assets, liabilities, rights and obligations. These agreements also include arrangements for transition services to be provided by OSG to the Company and by the Company to OSG. See Note 13, “Related Parties,” for additional discussion of the significant agreements with OSG. Reorganization On August 5, 2014, OSG and its subsidiaries, including INSW and certain of its subsidiaries (together with OSG, the “Debtors”), emerged from bankruptcy under Chapter 11 of Title 11 of the U.S. Code (the “Bankruptcy Code”). See Note 2, “Chapter 11 Filing and Emergence from Bankruptcy,” for further detail relating to OSG’s and INSW’s voluntary petitions for reorganization and subsequent emergence from bankruptcy. In conjunction with the plan of reorganization, OSG and INSW completed a series of capital contributions and distributions that resulted in all the entities that comprised the International Flag operations being owned by and being under the direct control of INSW upon emergence from bankruptcy (the “Emergence”). As INSW is the legal parent upon Emergence, the common stock and capital structure presented in these financial statements subsequent to Emergence is that of INSW. Nature of the Business The Company is engaged primarily in the ocean transportation of crude oil and petroleum products in the international market. The Company’s business is currently organized into two reportable segments: International Crude Tankers and International Product Carriers. The crude oil fleet is comprised of most major crude oil vessel classes. The products fleet transports refined petroleum product cargoes from refineries to consuming markets characterized by both long and short-haul routes. Through joint venture partnerships, the Company operates four liquefied natural gas (“LNG”) carriers and two Floating Storage and Offloading (“FSO”) service vessels. As of December 31, 2016, the Company’s operating fleet consisted of 55 vessels, 48 of which were owned (including four LNG carriers and two FSO service vessels in which the Company has joint venture ownership interests), with the remaining vessels chartered-in. Vessels chartered-in may be bareboat charters or time charters. Under either a bareboat charter or time charter, a customer pays a fixed daily or monthly rate for a fixed period of time for use of the vessel. Under a bareboat charter, the customer pays all costs of operating the vessel, including voyage expenses, such as fuel, canal tolls and port charges, and vessel expenses such as crew costs, vessel stores and supplies, lubricating oils, maintenance and repair, insurance and communications associated with operating the vessel. Under a time charter, the customer pays all voyage expenses and the shipowner pays all vessel expenses. The Company’s operating fleet list excludes vessels chartered-in where the duration of the charter was one year or less at inception. The Marshall Islands is the principal flag of registry of the Company’s vessels. Basis of Presentation The accompanying consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. For the eleven-month period ended November 30, 2016 and the years ended December 31, 2015 and 2014, the accompanying consolidated financial statements include the assets, liabilities, revenues and expenses of the individual entities that comprise the Company carved out from the historical results of operations, cost basis of the assets and liabilities and cash flows of OSG for these entities using both specific identification and allocation consistent with prior periods. For the eleven month period ended November 30, 2016 and the years ended December 31, 2015 and 2014, the Company functioned as part of the larger group of companies controlled by OSG, and accordingly, OSG performed certain corporate overhead functions for the Company. Therefore, certain costs related to the Company have been allocated from OSG. These allocated costs are primarily related to corporate administrative expenses, reorganization costs and employee related costs, including pensions and other benefits for corporate and shared employees, for the following functional groups: information technology, legal services, accounting and finance services, human resources, marketing and contract support, customer support, treasury and cash management, facility and other corporate and infrastructural services. The costs associated with these services and support functions have been allocated to the Company primarily based on either the proportion of time spent by employees within the above functions on tasks related to or for the benefit of the Company’s entities or the proportion of ship operating days of the Company. Ship operating days are defined as the total number of days vessels are owned or chartered in during a period. A portion of this cost allocation was offset by costs for certain corporate functions held within the Company (including information technology functions) that have historically provided services to OSG and non-INSW subsidiaries of OSG. The net costs allocated for these functions are included in general and administrative expenses, technical management and transition costs, severance costs and reorganization items, net within the consolidated financial statements. The tax provisions for the Company have been provided using a separate tax return methodology. Management believes the assumptions and allocations are reasonable. The expenses and cost allocations have been determined on a basis considered to be a reasonable reflection of the utilization of services provided to or the benefit received by the Company during the periods relative to the total costs incurred by OSG. However, the amounts recorded may not be representative of the amounts that would have been incurred had the Company been an entity that operated independently of OSG. Consequently, these consolidated financial statements may not be indicative of the Company’s future performance and do not necessarily reflect what its consolidated results of operations, financial position and cash flows would have been had the Company operated as a separate entity apart from OSG during the eleven-month period ended November 30, 2016 and the years ended December 31, 2015 and 2014. Following our spin-off from OSG, we now perform functions previously performed by OSG using internal resources and purchased services, some of which are being provided by OSG during a transitional period pursuant to the Transition Services Agreement. All intercompany balances and transactions within the Company have been eliminated. Investments in 50% or less owned affiliated companies, in which the Company exercises significant influence, are accounted for by the equity method. Dollar amounts, except per share amounts are in thousands.

CHAPTER 11 FILING AND EMERGENCE

CHAPTER 11 FILING AND EMERGENCE FROM BANKRUPTCY	12 Months Ended
	Dec. 31, 2016
Chapter 11 Filing and Emergence from Bankruptcy [Abstract]
Chapter 11 Filing and Emergence from Bankruptcy	NOTE 2 — CHAPTER 11 FILING AND EMERGENCE FROM BANKRUPTCY: Chapter 11 Filing On November 14, 2012 (the “Petition Date”), OSG and 180 of its subsidiaries including INSW Debtor entities, filed voluntary petitions for reorganization under Chapter 11 of the Bankruptcy Code in the U.S. Bankruptcy Court for the District of Delaware (the “Bankruptcy Court”). On March 7, 2014 , the Debtors filed a plan of reorganization supported by certain of the lenders under OSG’s $1,500,000 credit agreement, dated as of February 9, 2006 (the “Lender Plan”). On April 18, 2014, the Debtors received a proposal for an alternative plan of reorganization from certain holders of existing equity interests of OSG, which the Debtors determined to be more favorable to the Debtors’ creditors and equity interest holders than the Lender Plan (the “Equity Proposal”). Accordingly, the Debtors filed with the Bankruptcy Court a plan of reorganization that effectuated the terms of the Equity Proposal (as subsequently amended, the “Equity Plan”). The Bankruptcy Court confirmed the Equity Plan by order entered on July 18, 2014 (the “Confirmation Order”). On August 5, 2014 (the “Effective Date”), the Equity Plan became effective and OSG, including INSW Debtor entities, emerged from bankruptcy. On February 10, 2017, pursuant to a final decree and order of the Bankruptcy Court, OSG’s one remaining case, as the Parent Company, was closed. Summary of Emergence from Bankruptcy The financial restructuring was accomplished through exit financing and by using the proceeds from an OSG shareholder rights offering and OSG supplemental equity offering, and cash on hand to reduce outstanding indebtedness. Below is a summary of the significant events affecting INSW’s capital structure as a result of the Equity Plan becoming effective. Exit Financing and Entry into Credit Facilities On the Effective Date, to support the Equity Plan, the Company entered into a secured term loan facility of $628,375 (the “INSW Term Loan”) and a revolving loan facility of $50,000 (the “INSW Revolver Facility” and, together with the INSW Term Loan, the “INSW Exit Financing Facilities” or the “INSW Facilities”), among OSG, INSW, OIN Delaware LLC, the sole member of which is INSW, certain INSW subsidiaries, Jefferies Finance LLC, as Administrative Agent, and other lenders party thereto, both secured by a first lien on substantially all of the International Flag assets of the Company and its subsidiaries that, collectively, and together with funds provided by OSG, provided the funding necessary to satisfy the Equity Plan’s cash payment obligations, the expenses associated with closing the INSW Exit Financing Facilities and working capital to fund the Company’s operations after emergence from bankruptcy. On August 5, 2014, the available amounts under the INSW Term Loan were drawn in full. As of December 31, 2016, no amounts had been drawn under the INSW Revolver Facility. For additional information regarding the INSW Exit Financing Facilit ies see Note 9, “Debt,” to the consolidated financial statements. Management believes the implementation of the Equity Plan, closing on the INSW Exit Financing Facilities, reducing INSW’s activities in certain non-core areas and disposing of underperforming assets, has allowed the Company to generate sufficient cash to support its operations since emergence and will continue to do so over the next twelve months. Financial Reporting The Company prepared its consolidated financial statements in accordance with Accounting Standards Codification (“ASC”) 852, Reorganizations, and on a going-concern basis, which assumes continuity of operations, realization of assets and liabilities in the ordinary course. ASC 852 requires that financial statements for periods subsequent to the filing of the Chapter 11 cases distinguish transactions and events that are directly associated with the reorganization from the ongoing operations of the business. Accordingly, all transactions (including but not limited to, all professional fees and other expenses, realized gains and losses, and provisions for losses) directly associated with the reorganization and restructuring of the business are reported separately as reorganization items in the consolidated statements of operations. Upon OSG’s emergence from Chapter 11 bankruptcy proceedings on August 5, 2014, OSG was not required to apply fresh start accounting based on the provisions of ASC 852 since holders of OSG’s outstanding common shares immediately before confirmation of the Equity Plan received more than 50% of OSG’s outstanding common shares upon emergence. Accordingly, a new reporting entity was not created for accounting purposes. All of the OSG subsidiaries that comprise the INSW carve out group were directly or indirectly wholly owned by OSG immediately before confirmation of the Equity Plan and immediately after confirmation of the Equity Plan. Reorganization Items, net Reorganization items, net represent amounts incurred subsequent to the Petition Date as a direct result of the filing of the Chapter 11 cases and are comprised of the following:     For the year ended December 31, 2016 2015 2014  Allocated trustee fees $ 74 $ 147 $ 1,929  Allocated professional fees (3,220) 5,422 81,381  Provision for and expenses incurred on rejected executory contracts  including post-petition interest - - 6,419  Provision for post-petition interest on debt facilities - - 10,095  2004 Stock Incentive Plan - - 1,374  Other claim adjustments 3,277 90 3,330  $ 131 $ 5,659 $ 104,528  The table above reflects the recovery of previously allocated professional fees associated with a litigation matter that OSG subsequently settled for an amount in excess of its related out-of-pocket expenses.  Cash paid for reorganization items was $0 , $0 , and $303,739 for the years ended December 31, 2016 , 2015 and 2014 , respectively. For the years ended December 31, 2016 , 2015 and 201 4 , the allocation of non-cash reorganization expenses of $131 , $5,659 and $87,197 , respectively, were recorded as capital contributions from OSG.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2016
Significant Accounting Policies [Abstract]
Significant Accounting Policies	NOTE 3 — SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: 1. Cash and cash equivalents — Interest-bearing deposits that are highly liquid investments and have a maturity of three months or less when purchased are included in cash and cash equivalents. Legally restricted cash as of December 31, 2015 of $8,989 , relating to the INSW Facilities, is included in the non-current assets section of the consolidated balance sheets. The INSW Facilities stipulate that if annual aggregate cash proceeds of INSW asset sales exceed $5,000 , cash proceeds from each such sale were required to be reinvested in vessels within twelve months of such sale or used to prepay the principal balance outstanding of the INSW Term Loan. Activity relating to restricted cash is reflected in investing activities in the consolidated statements of cash flow. See Note 9, “Debt,” for a further discussion of the INSW Term Loan.  2. Concentration of Credit Risk — Financial instruments that potentially subject the Company to concentrations of credit risk are voyage receivables due from charterers and pools in which the Company participates. With respect to voyage receivables, the Company limits its credit risk by performing ongoing credit evaluations. Voyage receivables reflected in the consolidated balance sheets as of December 31, 2016 and 2015 are net of an allowance for doubtful accounts of $70 and $415 , respectively. The provisions for doubtful accounts for the years ended December 31, 2016, 2015 and 2014 were not material. During the three years ended December 31, 2016, the Company did not have any individual customers who accounted for 10% or more of its revenues apart from the pools in which it participates. The pools in which the Company participates accounted for 90% and 82% of consolidated voyage receivables at December 31, 2016 and 2015.  3. Inventories —Inventories, which consists principally of fuel, are stated at cost determined on a first-in, first-out basis.  4. Vessels, vessel lives, deferred drydocking expenditures and other property —Vessels are recorded at cost and are depreciated to their estimated salvage value on the straight-line basis over the lives of the vessels, which are generally 25 years. Each vessel’s salvage value is equal to the product of its lightweight tonnage and an estimated scrap rate of $300 per ton. Other property, including leasehold improvements, are recorded at cost and amortized on a straight-line basis over the shorter of the terms of the leases or the estimated useful lives of the assets, which range from three to seven years.  Interest costs are capitalized to vessels during the period that vessels are under construction, however, no interest was capitalized during 2016, 2015 or 2014. Expenditures incurred during a drydocking are deferred and amortized on the straight-line basis over the period until the next scheduled drydocking, generally two and a half to five years. The Company only includes in deferred drydocking costs those direct costs that are incurred as part of the drydocking to meet regulatory requirements, or are expenditures that add economic life to the vessel, increase the vessel’s earnings capacity or improve the vessel’s efficiency. Direct costs include shipyard costs as well as the costs of placing the vessel in the shipyard. Expenditures for normal maintenance and repairs, whether incurred as part of the drydocking or not, are expensed as incurred.  The carrying value of each of the Company’s vessels represents its original cost at the time it was delivered or purchased less depreciation calculated using estimated useful lives from the date such vessel was originally delivered from the shipyard. A vessel’s carrying value is reduced to its new cost basis (i.e., its current fair value) if a vessel impairment charge is recorded. 5. Impairment of long-lived assets —The carrying amounts of long-lived assets held and used by the Company are reviewed for potential impairment whenever events or changes in circumstances indicate that the carrying amount of a particular asset may not be fully recoverable. In such instances, an impairment charge would be recognized if the estimate of the undiscounted future cash flows expected to result from the use of the asset and its eventual disposition is less than the asset’s carrying amount. This assessment is made at the individual vessel level since separately identifiable cash flow information for each vessel is available. The impairment charge, if any, would be measured as the amount by which the carrying amount of a vessel exceeded its fair value. If using an income approach in determining the fair value of a vessel, the Company will consider the discounted cash flows resulting from highest and best use of the vessel asset from a market-participant’s perspective. Alternatively, if using a market approach, the Company will obtain third party appraisals of the estimated fair value of the vessel. A long lived asset impairment charge results in a new cost basis being established for the relevant long lived asset. See Note 6, “Vessels,” for further discussion on the impairment tests performed on certain of our vessels during the three years ended December 31, 2016.  6. Deferred finance charges —Finance charges incurred in the arrangement and /or amendments resulting in the modification of debt are deferred and amortized to interest expense on either an effective interest method or straight-line basis over the life of the related debt. Unamortized deferred finance charges of $ 1,691 and $1,741 relating to the INSW Revolver Facility are included in other assets in the consolidated balance sheets as of December 31, 2016 and 2015, respectively. Unamortized deferred finance charges of $19,827 and $22,866 relating to the INSW Term Loan (as defined in Note 9, “Debt”) are included in long-term debt (reflecting the adoption of ASU No. 2015-03) on the consolidated balance sheets as of December 31, 2016 and 2015.  Interest expense relating to the amortization of deferred financing costs amounted to $6,449 in 2016 , $ 5,625 in 2015 and $1,928 in 2014 .  7. Revenue and expense recognition —Revenues from time charters and bareboat charters are accounted for as operating leases and are thus recognized ratably over the rental periods of such charters, as service is performed. Voyage revenues and expenses are recognized ratably over the estimated length of each voyage, calculated on a discharge-to-discharge basis and, therefore, are allocated between reporting periods based on the relative transit time in each period. The impact of recognizing voyage expenses ratably over the length of each voyage is not materially different on a quarterly and annual basis from a method of recognizing such costs as incurred. The Company does not begin recognizing voyage revenue until a charter has been agreed to by both the Company and the customer, even if the vessel has discharged its cargo and is sailing to the anticipated load port on its next voyage. Under voyage charters, expenses such as fuel, port charges, canal tolls, cargo handling operations and brokerage commissions are paid by the Company whereas, under time and bareboat charters, such voyage costs are paid by the Company’s customers. For the Company’s vessels operating in pools, revenues and voyage expenses are pooled and allocated to each pool’s participants on a time charter equivalent (“TCE”) basis in accordance with an agreed-upon formula. Such TCE revenues are reported as pool revenues in the accompanying consolidated statement of operations. For the pools in which the Company participates, management monitors, among other things, the relative proportion of the Company’s vessels operating in each of the pools to the total number of vessels in each of the respective pools, and assesses whether or not the Company’s participation interest in each of the pools is sufficiently significant so as to determine that the Company has effective control of the pool. Management determined that as of June 30, 2013, it had effective control of one of the pools in which the Company participated. Such pool was not a legal entity but operated under a contractual agreement. Therefore, effective July 1, 2013 and through to June 30, 2014, when the Company exited this pool, the Company’s allocated TCE revenues for such pool were reported on a gross basis as voyage charter revenues and voyage expenses in the consolidated statement of operations. The impact of this method of presenting earnings for this pool for the year ended December 31, 2014 was an increase in both voyage charter revenues and voyage expenses of $40,454 . 8. Derivatives —ASC 815, Derivatives and Hedging , requires the Company to recognize all derivatives on the balance sheet at fair value. Derivatives that are not effective hedges must be adjusted to fair value through earnings. If the derivative is an effective hedge, depending on the nature of the hedge, a change in the fair value of the derivative is either offset against the change in fair value of the hedged item (fair value hedge), or recognized in other comprehensive income/(loss) and reclassified into earnings in the same period or periods during which the hedge transaction affects earnings (cash flow hedge). The ineffective portion (that is, the change in fair value of the derivative that does not offset the change in fair value of the hedged item) of an effective hedge and the full amount of the change in fair value of derivative instruments that do not qualify for hedge accounting are immediately recognized in earnings. The Company formally documents all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivatives that are designated as cash flow hedges to forecasted transactions. The Company also formally assesses (both at the hedge's inception and on an ongoing basis) whether the derivatives that are used in hedging transactions have been highly effective in offsetting changes in the cash flows of hedged items and whether those derivatives may be expected to remain highly effective in future periods. When it is determined that a derivative is not (or has ceased to be) highly effective as a hedge, the Company discontinues hedge accounting prospectively, as discussed below. The Company discontinues hedge accounting prospectively when (1) it determines that the derivative is no longer effective in offsetting changes in the cash flows of a hedged item such as forecasted transactions; (2) the derivative expires or is sold, terminated, or exercised; (3) it is no longer probable that the forecasted transaction will occur; or (4) management determines that designating the derivative as a hedging instrument is no longer appropriate or desired. When the Company discontinues hedge accounting because it is no longer probable that the forecasted transaction will occur in the originally expected period, the gain or loss on the derivative remains in accumulated other comprehensive loss and is reclassified into earnings when the forecasted transaction affects earnings. However, if it is probable that a forecasted transaction will not occur by the end of the originally specified time period or within an additional two-month period of time thereafter, the gains and losses that were accumulated in other comprehensive loss will be recognized immediately in earnings. In all situations in which hedge accounting is discontinued and the derivative remains outstanding, the Company will carry the derivative at its fair value on the balance sheet, recognizing changes in the fair value in current-period earnings, unless it is designated in a new hedging relationship. During the three years ended December 31, 2016, no ineffectiveness gains or losses were recorded in earnings relative to interest rate caps entered into by the Company or its subsidiaries that qualified for hedge accounting. Any gain or loss realized upon the early termination of an interest rate cap is recognized as an adjustment of interest expense over the shorter of the remaining term of the cap or the hedged debt. See Note 10, “Fair Value of Financial Instruments, Derivatives and Fair Value Disclosures,” for additional disclosures on the Company’s interest rate caps and other financial instruments. 9. Income taxes — Substantially all of the companies included in the Company’s consolidated financial statements were excluded from the OSG consolidated group for U.S. income tax purposes for the eleven month period ended November 30, 2016 and the years ended December 31, 2015 and 2014 . T he Company’s financial statements have been prepared on the basis that OSG was responsible for all U.S. taxes for periods prior to December 1, 2016. Prior to December 1, 2016, the Company had not operated as an independent stand-alone entity. However, for the purposes of these consolidated financial statements the Company has calculated income taxes as if it had filed relevant income tax returns on a stand-alone basis. T he Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. Net deferred tax assets are recorded to the extent the Company believes these assets will more likely than not be realized. In making such a determination, all available positive and negative evidence is considered, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. In the event the Company were to determine that it would be able to realize its deferred income tax assets in the future in excess of their net recorded amount, an adjustment would be made to the deferred tax asset valuation allowance, which would reduce the provision for income taxes in the period such determination is made. Uncertain tax positions are recorded in accordance with ASC 740, Income Taxes, on the basis of a two-step process whereby (1) the Company first determines whether it is more likely than not that the tax positions will be sustained based on the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the largest amount of tax benefit that is greater than 50% likely to be realized upon ultimate settlement with the related tax authority. 10. Valuation of equity method investments — When events and circumstances warrant, investments accounted for under the equity method of accounting are evaluated for impairment. An impairment charge is recorded whenever a decline in fair value of an investment below its carrying amount is determined to be other-than-temporary. Impairment charges related to equity method investments are record ed in equity in i ncome of a ffiliated c ompanies in the accompanying consolidated statements of operations . See Note 7, “Equity Method Investments,” for further discussion of the impairment tests performed on certain of our equity method investments during the year ended December 31, 2016.  11. Use of estimates —The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts of assets, liabilities, equity, revenues and expenses reported in the financial statements and accompanying notes. The most significant estimates relate to the depreciation of vessels and other property, amortization of drydocking costs, estimates used in assessing the recoverability of goodwill, equity method investments, intangible and other long-lived assets, liabilities incurred relating to pension benefits, and income taxes. Actual results could differ from those estimates.  12. Recently Adopted Accounting Standards — In August 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (ASC 205), which explicitly requires management to assess an entity’s ability to continue as a going concern and disclose going concern uncertainties in connection with each annual and interim period. The new standard requires management to assess if there is substantial doubt about an entity’s ability to continue to meet its obligations within one year after the reporting date based upon management’s consideration of relevant conditions that are known (and reasonably knowable) at the issuance date. The new standard defines substantial doubt and provides example indicators. Disclosures will be required if conditions give rise to substantial doubt. However, management will need to assess if its plans will alleviate substantial doubt to determine the specific disclosures. The new standard is effective for all entities in the first annual period ending after December 15, 2016. The adoption of this accounting standard did not have any impact on the Company’s consolidated financial statements.  13. Recently Issued Accounting Standards — In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASC 715), which requires that an employer classify and report the service cost component in the same line item or items in the statement of operations as other compensation costs arising from services rendered by the pertinent employees during the period and disclose by line item in the statement of operations, the amount of net benefit cost that is included in the statement of operations. The other components of net benefit cost would be presented in the statement operations separately from the service cost component and outside the subtotal of income from operations. The standard will be effective for interim and annual periods beginning after December 31, 2017 and early adoption is permitted. The guidance requires application using a retrospective transition method.  In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (ASC 230): Restricted Cash , which requires that amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The standard will be effective for annual periods beginning after December 31, 2017 and interim periods within that reporting period. Management does not expect the adoption of this accounting standard to have a material impact on the Company’s consolidated statements of cash flows.  In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (ASC 230), which amends the guidance in ASC 230 on the classification of certain cash receipts and payments in the statement of cash flows. The primary purpose of the ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic with respect to (1) debt prepayment or debt extinguishment costs; (2) settlement of zero-coupon debt; (3) contingent consideration payments made after a business combination; (4) proceeds from the settlement of insurance claims; (5) proceeds from the settlement of corporate-owned life insurance policies; (6) distributions received from equity method investees; (7) beneficial interests in securitization transactions; and (8) separately identifiable cash flows and application of the predominance principle. The standard will be effective for interim and annual periods beginning after December 31, 2017 and early adoption is permitted. The guidance requires application using a retrospective transition method. Management is currently reviewing the impact of the adoption of this accounting standard on the Company’s consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (ASC 718), which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, forfeitures, classification of awards as either equity or liabilities, and classification in the statement of cash flows. The standard will be effective for annual periods beginning after December 31, 2016 and interim periods within that reporting period. Management does not expect the adoption of this accounting standard to have any impact on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (ASC 842), which requires lessees to recognize most leases on the balance sheet. This is expected to increase both reported assets and liabilities. For public companies, the standard will be effective for the first interim reporting period within annual periods beginning after December 15, 2018, although early adoption is permitted. Lessees and lessors will be required to apply the new standard at the beginning of the earliest period presented in the financial statements in which they first apply the new guidance, using a modified retrospective transition method. The requirements of this standard include a significant increase in required disclosures. Management is analyzing the impact of the adoption of this guidance on the Company’s consolidated financial statements, including assessing changes that might be necessary to information technology systems, processes and internal controls to capture new data and address changes in financial reporting. Management expects that the Company could recognize increases in reported amounts for property, plant and equipment and related lease liabilities upon adoption of the new standard.  In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASC 606), a standard that will supersede virtually all of the existing revenue recognition guidance in U.S. GAAP. The standard establishes a five-step model that will apply to revenue earned from a contract with a customer. The standard’s requirements will also apply to the sale of some non-financial assets that are not part of an entity’s ordinary activities (e.g., sales of property or plant and equipment). Extensive disclosures will be required, including disaggregation of total revenue, information about performance obligations, changes in contract asset and liability account balances between periods and key judgments and estimates. The FASB has recently issued several amendments to the standard, including clarification of the accounting for licenses of intellectual property and identifying performance obligations. The guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the cumulative catch-up transition method). The new standard will be effective for us beginning January 1, 2018. We currently anticipate adopting the standard using the cumulative catch-up transition method , however, as our evaluation progresses we may ultimately elect the alternative approach. We are undertaking a comprehensive approach to assess the impact of the guidance on our business by reviewing our current accounting policies and practices to identify any potential differences that may result from applying the new requirements to our consolidated financial statements. We are also consulting with other shipping companies on business assumptions, processes, systems and controls to determine revenue recognition and disclosure under the new standard. We continue to make progress on our review of the standard. Our initial assessment may change as we continue to refine these assumptions. 

EARNINGS PER COMMON SHARE

EARNINGS PER COMMON SHARE	12 Months Ended
	Dec. 31, 2016
Earnings per Common Share [Abstract]
Earnings per Common Share	NOTE 4 — EARNINGS PER COMMON SHARE: Basic earnings per common share is computed by dividing earnings, after the deduction of dividends and undistributed earnings allocated to participating securities, by the weighted average number of common shares outstanding during the period. The computation of diluted earnings per share assumes the issuance of common stock for all potentially dilutive stock options and restricted stock units not classified as participating securities. Participating securities are defined by ASC 260, Earnings Per Share, as unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents and are included in the computation of earnings per share pursuant to the two-class method.  As discussed in Note 1, “Description of Business and Basis of Presentation,” the Company effected a stock split on its 102.21 issued and outstanding shares of common stock, which were all owned by OSG, to allow for a pro rata dividend of such shares to the holders of OSG common stock and warrants. In accordance with ASC 260, Earnings Per Share , the Company adjusted the computations of basic and diluted earnings per share retroactively for all periods presented to reflect that change in its capital structure. The table below shows the effect of the stock split on the calculation of per share amounts previously reported:    Year ended  December 31, 2015 December 31, 2014  Increase in weighted average number of shares outstanding used to calculate basic and diluted net income/(loss) per share amounts 29,157,285 29,157,285   Change in net income/(loss) per share - basic and diluted $ (1,694,250.98) $ 1,165,234.16 There were 1,489 , 0 and 0 weighted average shares of unvested restricted common stock shares considered to be participating securities for the years ended December 31, 2016, 2015 and 2014, respectively. Such participating securities are allocated a portion of income , but not losses under the two-class method . Accordingly, no allocation was made to the participating securities under the two-class method for the year ended December 31, 2016. As of December 31, 2016, there were 60,238 shares of restricted stock units and 127,559 stock options outstanding and considered to be potentially dilutive securities. The components of the calculation of basic and diluted earnings per share are as follows:    For the year ended December 31, 2016 2015 2014  Net (loss)/income $ (18,223) $ 173,170 $ (119,099)   Weighted average common shares outstanding:  Common stock - basic 29,157,992 - - 29,157,387 - - 29,157,387  Common stock - diluted 29,157,992 - - 29,157,387 - - 29,157,387  Reconciliations of the numerator of the basic and diluted earnings per share computations are as follows:     For the year ended December 31, 2016 2015 2014  Net (loss)/income allocated to:  Common Stockholders $ (18,223) $ 173,170 $ (119,099)  Participating securities - - -  $ (18,223) $ 173,170 $ (119,099)  There were no dilutive equity awards ou tstanding as of December 31, 2016, 2015 or 2014. Awards of 11,153 shares of common stock were not included in the computation of diluted earnings per share for 2016 because inclusion of these awards would be anti-dilutive.

BUSINESS AND SEGMENT REPORTING

BUSINESS AND SEGMENT REPORTING	12 Months Ended
	Dec. 31, 2016
Business and Segment Reporting [Abstract]
Business and Segment Reporting	NOTE 5 — BUSINESS AND SEGMENT REPORTING: The Company is engaged primarily in the ocean transportation of crude oil and petroleum products in the international market through the ownership and operation of a diversified fleet of vessels. The shipping industry has many distinct market segments based, in large part, on the size and design configuration of vessels required and, in some cases, on the flag of registry. Rates in each market segment are determined by a variety of factors affecting the supply and demand for vessels to move cargoes in the trades for which they are suited. Tankers are not bound to specific ports or schedules and therefore can respond to market opportunities by moving between trades and geographical areas. The Company charters its vessels to commercial shippers and foreign governments and governmental agencies primarily on voyage charters and on time charters.  The Company has two reportable segments: International Crude Tankers and International Product Carriers. Adjusted income/(loss) from vessel operations for segment reporting is defined as income/(loss) from vessel operations before general and administrative expenses, severance costs, separation and transition costs, technical management transition costs, and gain/(loss) on disposal of vessels, including impairment charges. The accounting policies followed by the reportable segments are the same as those followed in the preparation of the Company’s consolidated financial statements. Information about the Company’s reportable segments as of and for each of the years in the three-year period ended December 31, 2016 follows:       Crude Product  Tankers Carriers Other Totals  2016  Shipping revenues $ 271,764 $ 126,555 $ - $ 398,319  Time charter equivalent revenues 258,171 126,314 560 385,045  Depreciation and amortization 52,395 26,696 794 79,885  Gain/(loss) on disposal of vessels and other property, including impairments (7,585) (71,456) (162) (79,203)  Adjusted income from vessel operations 111,768 13,327 710 125,805  Equity in income of affiliated companies 5,584 - 11,265 16,849  Investments in and advances to affiliated companies at December 31, 2016 266,470 15,296 76,915 358,681  Adjusted total assets at December 31, 2016 1,066,184 422,579 76,915 1,565,678  Expenditures for vessels and vessel improvements 691 1,297 - 1,988  Payments for drydockings 7,636 1,622 - 9,258  2015  Shipping revenues 324,703 172,931 - 497,634  Time charter equivalent revenues 304,182 171,608 - 475,790  Depreciation and amortization 51,347 28,763 1,543 81,653  Gain/(loss) on disposal of vessels and other property (31) 3,231 1,259 4,459  Adjusted income/(loss) from vessel operations 157,840 56,746 (1,176) 213,410  Equity in income of affiliated companies 34,371 - 11,188 45,559  Investments in and advances to affiliated companies at December 31, 2015 276,839 13,793 54,259 344,891  Adjusted total assets at December 31, 2015 1,148,361 505,353 43,340 1,697,054  Expenditures for vessels and vessel improvements 91 873 - 964  Payments for drydockings 13,842 6,886 - 20,728  2014  Shipping revenues 363,331 153,665 22 517,018  Time charter equivalent revenues 228,296 118,669 22 346,987  Depreciation and amortization 56,280 26,893 1,758 84,931  Gain/(loss) on disposal of vessels and other property 9,978 (44) 21 9,955  Adjusted income/(loss) from vessel operations 65,462 3,386 (1,519) 67,329  Equity in income of affiliated companies 30,837 - 7,035 37,872  Investments in and advances to affiliated companies at December 31, 2014 277,815 11,334 42,286 331,435  Adjusted total assets at December 31, 2014 1,191,490 551,569 25,368 1,768,427  Expenditures for vessels and vessel improvements 1,437 20,017 - 21,454  Payments for drydockings 5,286 6,792 - 12,078  The joint venture with four LNG Carriers is included in Other. The joint venture with two floating storage and offloading service vessels is included in the International Crude Tankers Segment.  Reconciliations of time charter equivalent revenues of the segments to shipping revenues as reported in the consolidated statements of operations follow:     For the year ended December 31, 2016 2015 2014  Time charter equivalent revenues $ 385,045 $ 475,790 $ 346,987  Add: Voyage expenses 13,274 21,844 170,031  Shipping revenues $ 398,319 $ 497,634 $ 517,018   Consistent with general practice in the shipping industry, the Company uses time charter equivalent revenues, which represents shipping revenues less voyage expenses, as a measure to compare revenue generated from a voyage charter to revenue generated from a time charter. Time charter equivalent revenues, a non-GAAP measure, provides additional meaningful information in conjunction with shipping revenues, the most directly comparable GAAP measure, because it assists Company management in making decisions regarding the deployment and use of its vessels and in evaluating their financial performance. Reconciliations of adjusted income from vessel operations of the segments to income/(loss) before income taxes, as reported in the consolidated statements of operations follow:     For the year ended December 31, 2016 2015 2014  Total adjusted income from vessel operations of all segments $ 125,805 $ 213,410 $ 67,329  General and administrative expenses (31,618) (41,516) (52,597)  Severance costs - - (16,666)  Separation and transition costs (9,043) - -  Technical management transition costs - (39) (3,417)  Gain/(loss) on disposal of vessels and other property, including impairments (79,203) 4,459 9,955  Consolidated income from vessel operations 5,941 176,314 4,604  Equity in income of affiliated companies 16,849 45,559 37,872  Other income/(expense) (966) 66 (45)  Interest expense (39,476) (42,970) (56,258)  Reorganization items, net (131) (5,659) (104,528)  Income/(loss) before income taxes $ (17,783) $ 173,310 $ (118,355)  Reconciliations of total assets of the segments to amounts included in the consolidated balance sheets follow:    At December 31, 2016 2015  Total adjusted assets of all segments $ 1,565,678 $ 1,697,054  Corporate unrestricted cash and cash equivalents 92,001 308,858  Corporate restricted cash - 8,989  Other unallocated amounts 4,842 15,049  Consolidated total assets $ 1,662,521 $ 2,029,950   Certain additional information about the Company’s operations for each of the years in the three year period ended December 31, 2016 follows:     Crude Product  Consolidated Tankers Carriers Other  2016  Total vessels, deferred drydock and other property at December 31, 2016 $ 1,130,607 $ 753,028 $ 377,095 $ 484  2015  Total vessels, deferred drydock and other property at December 31, 2015 $ 1,277,486 $ 804,514 $ 472,675 $ 297  2014  Total vessels, deferred drydock and other property at December 31, 2014 $ 1,345,863 $ 837,950 $ 499,822 $ 8,091

VESSELS, DEFERRED DRYDOCK AND O

VESSELS, DEFERRED DRYDOCK AND OTHER PROPERTY	12 Months Ended
	Dec. 31, 2016
Vessels, Deferred Drydock and Other Property [Abstract]
Vessels, Deferred Drydock and Other Property	NOTE 6 — VESSELS, DEFERRED DRYDOCK AND OTHER PROPERTY: Vessels and other property consist of the following:    As of 2016 2015  Vessels, at cost $ 1,478,940 $ 1,642,891  Accumulated depreciation (381,449) (404,957)  Vessels, net 1,097,491 1,237,934   Other property, at cost 8,680 8,126  Accumulated depreciation and amortization (6,121) (5,649)  Other property, net 2,559 2,477   Total Vessels and other property $ 1,100,050 $ 1,240,411  All except one of the Company’s vessels are pledged as collateral under the INSW Facilities (see Note 9, “Debt”). The aggregate carrying value of the 41 vessels pledged as collateral under the INSW Facilities at December 31, 2016 was $1,092,072 . A breakdown of the carrying value of the Company’s vessels by reportable segment and fleet as of December 31, 2016 and 2015 follows:      As of December 31, 2016  Net Average Number of  Accumulated Carrying Vessel Age Owned  Cost Depreciation Value (by dwt) Vessels   International Flag Crude Tankers  VLCC (includes ULCC) $ 681,891 $ (235,159) $ 446,732 12.1 9  Aframax 247,863 (66,943) 180,920 11.6 7  Panamax 121,810 (18,506) 103,304 14.3 8  Total International Flag Crude Tankers 1,051,564 (320,608) 730,956 (1) 12.3 24   International Flag Product Carriers  LR2 73,681 (6,601) 67,080 2.4 1  LR1 106,176 (8,474) 97,702 8.1 4  MR 247,519 (45,766) 201,753 11.2 13  Total International Flag Product Carriers 427,376 (60,841) 366,535 (2) 9.3 18   Fleet Total $ 1,478,940 $ (381,449) $ 1,097,491 11.7 42  (1) Includes one ULCC, eight VLCCs, seven Aframaxes and seven Panamaxes with an aggregate carrying value of $722,883 , which the Company believes exceeds their aggregate market values (estimated by taking an average of two third party vessel appraisals) of approximately $556,625 by $166,258 . (2) Includes one LR2, four LR1s and five MRs with an aggregate carrying value of $306,450 , which the Company believes exceeds their aggregate market values (estimated by taking an average of two third party vessel appraisals) of approximately $228,125 , by $78,325 .      As of December 31, 2015  Net Average Number of  Accumulated Carrying Vessel Age Owned  Cost Depreciation Value (by dwt) Vessels   International Flag Crude Tankers  VLCC (includes ULCC) $ 681,834 $ (211,153) $ 470,681 11.1 9  Aframax 270,246 (76,597) 193,649 10.6 7  Panamax 128,613 (14,113) 114,500 13.3 8  Total International Flag Crude Tankers 1,080,693 (301,863) 778,830 11.3 24   International Flag Product Carriers  LR2 73,681 (3,896) 69,785 1.4 1  LR1 197,137 (47,182) 149,955 7.1 4  MR 291,380 (52,016) 239,364 10.2 13  Total International Flag Product Carriers 562,198 (103,094) 459,104 8.1 18   Fleet Total $ 1,642,891 $ (404,957) $ 1,237,934 10.7 42 Vessel activity, excluding construction in progress, for the three years ended December 31, 2016 is summarized as follows:      Accumulated Net Book  Vessel Cost Depreciation Value  Balance at January 1, 2014 $ 1,641,573 $ (280,774) $ 1,360,799  Purchases and vessel additions 13,623 -  Transfers from Construction in Progress 62,475 -  Disposals (69,556) 4,809  Depreciation - (65,610)  Balance at December 31, 2014 1,648,115 (341,575) 1,306,540  Purchases and vessel additions 1,531 -  Disposals (6,755) 1,003  Depreciation - (64,385)  Balance at December 31, 2015 1,642,891 (404,957) 1,237,934  Purchases and vessel additions 2,127 -  Depreciation - (63,328)  Impairment (166,078) 86,836  Balance at December 31, 2016 $ 1,478,940 $ (381,449) $ 1,097,491  The total of purchases and vessel additions will differ from expenditures for vessels as shown in the consolidated statements of cash flows because of expenditures for vessels remaining under construction at the beginning and end of each respective period and the timing of when payments were made and the timing of actual payments. Vessel Impairments The Company has been monitoring the industry wide decline in vessel valuations during 2016 and specifically from June 30, 2016 to September 30, 2016, and September 30, 2016 to December 31, 2016, as well as the decline in forecasted near term charter rates, and concluded that the declines in vessel valuations and in forecasted near term charter rates constituted impairment trigger events for 28 vessels as of September 30, 2016 and 24 vessels as of December 31, 2016. In developing estimates of undiscounted future cash flows for performing Step 1 of the impairment tests, the Company made assumptions about future performance, with significant assumptions being related to charter rates, ship operating expenses, utilization, drydocking requirements, residual value and the estimated remaining useful lives of the vessels. These assumptions are based on historical trends as well as future expectations. The estimated daily time charter equivalent rates used for unfixed days were based on a combination of (i) internally forecasted rates that are consistent with forecasts provided to the Company’s senior management and Board of Directors, and (ii) the trailing 12-year historical average rates, based on monthly average rates published by a third party maritime research service. The internally forecasted rates were based on management’s evaluation of current economic data and trends in the shipping and oil and gas industries. Management used the published 12-year historical average rates in its assumptions because it is management’s belief that the 12-year period captures an even distribution of strong and weak charter rate periods, which results in the use of an average mid-cycle rate that is more in line with management’s forecast of a return to mid-cycle charter rate levels in the medium term. Recognizing that the transportation of crude oil and petroleum products is cyclical and subject to significant volatility based on factors beyond the Company’s control, management believes the use of estimates based on the combination of internally forecasted rates and 12-year historical average rates calculated as of the reporting date to be reasonable.  Estimated outflows for operating expenses and drydocking requirements are based on historical and budgeted costs and are adjusted for assumed inflation. Utilization is based on historical levels achieved and estimates of residual value are consistent with the pattern of scrap rates used in management’s evaluation of salvage value.  In estimating the fair value of the vessels for the purposes of Step 2 of the September 30, 2016 impairment tests, the Company developed fair value estimates that utilized a market approach which considered an average of two vessel appraisals. Based on the tests performed, impairment charges totaling $49,640 were recorded on two LR1s, an Aframax and a Panamax to write-down their carrying values to their estimated fair values at September 30, 2016. In estimating the fair values of the vessels for the purposes of Step 2 of the December 31, 2016 impairment tests, the Company considered the market and income approaches by using a combination of third party appraisals and discounted cash flow models prepared by the Company. In preparing the discounted cash flow models, the Company used a methodology consistent with that described above, and discounted the cash flows using its current estimate of INSW’s weighted average cost of capital. Based on the tests performed, impairment charges aggregating $29,602 were recorded on one Panamax and seven MRs to write-down their carrying values to their estimated fair values at December 31, 2016.  During its quarterly evaluations as to whether or not events or circumstances existing during 2015 resulted in a triggering event for impairment testing of its fleet, Management gave consideration to average TCE rates earned by its vessels versus INSW’s 2015 budget, near term rate forecasts, significant changes in third party valuation appraisals of vessels, and plans or intentions that materially affect how the international fleet will be used in the next 12 months (including disposals). Management concluded there was no triggering event for impairment testing.  Management also gave consideration as to whether events or changes in circumstances had occurred since December 2014 that could indicate that the carrying amounts of the vessels in its fleet may not be recoverable as of December 31, 2015. INSW concluded that no such events or changes in circumstances had occurred to warrant a change in the assumptions utilized in the December 2014 impairment tests of its fleet.  At December 31, 2014, m anagement gave consideration to average TCE rates earned by INSW’s vessels versus INSW’s 2014 budget, near term rate forecasts, and significant changes in third party valuation appraisals of vessels. Management noted a decline in valuations for certain of its MRs and determined that four such vessels (built between 2009 and 2011) having market valuations below their carrying values at December 31, 2014 should be tested for impairment. Based on tests performed, it was determined that the vessels would generate undiscounted cash flows in excess of their December 31, 2014 carrying values over the remainder of their useful lives.  Management also gave consideration as to whether other events or changes in circumstances had occurred since December 31, 2013 that could indicate that the carrying amounts of the remaining vessels in its International Flag fleet may not be recoverable as of December 31, 2014. Management concluded that no such events had occurred to warrant a change in the assumptions from those utilized in the December 31, 2013 test. Vessel Deliveries  There were no vessels acquired during the years ended December 31, 2016 and 2015. The Company completed construction and took delivery of an LR2, which is a coated Aframax , during the year ended December 31, 2014.  Vessel Sales  There were no vessels sold during the year ended December 31, 2016. During the year ended December 31, 2015, the Company sold a 1998-built MR and recognized a gain of $3,236 on the sale of this vessel. For the year ended December 31, 2014, the Company recognized a gain on disposal of vessels of $9,955 , including a gain of $10,325 relating to the sale of five International Flag Crude Tankers (two VLCCs, a Panamax and two Aframaxes which had been employed in Lightering operations). Drydocking activity for the three years ended December 31, 2016 is summarized as follows:     For the year ended December 31, 2016 2015 2014  Balance at January 1 $ 37,075 $ 29,325 $ 36,053  Additions 8,822 22,981 12,078  Sub-total 45,897 52,306 48,131  Drydock amortization (15,340) (15,231) (16,441)  Amounts recognized upon sale/redelivery of vessels and non-cash adjustments - - (2,365)  Balance at December 31 $ 30,557 $ 37,075 $ 29,325 

EQUITY METHOD INVESTMENTS

EQUITY METHOD INVESTMENTS	12 Months Ended
	Dec. 31, 2016
Equity Method Investments [Abstract]
Equity Method Investments	NOTE 7 — EQUITY METHOD INVESTMENTS: Investments in affiliated companies include joint ventures accounted for using the equity method. As of December 31, 2016, the Company had an approximate 50% interest in three joint ventures. One joint venture operates four LNG carriers (the “LNG Joint Venture”). The other two joint ventures converted two ULCCs to Floating Storage and Offloading Service vessels (collectively the “FSO Joint Venture”). FSO Joint Venture Maersk Oil Qatar AS awarded two service contracts to the FSO Joint Venture between INSW and Euronav NV to provide two vessels, the FSO Asia and the FSO Africa, to perform FSO services in the Al Shaheen Field off the shore of Qatar. The Company has a 50% interest in this joint venture. The joint venture financed the purchase of the vessels from each of Euronav NV and INSW and their conversion costs through partner loans and a long-term bank financing, which is secured by, among other things, the service contracts and the FSOs themselves. Approximately $75,343 and $104,200 was outstanding under the bank financing facility as of December 31, 2016 and December 31, 2015, respectively, with the outstanding amount of this facility being subject to acceleration, in whole or in part, on termination of one or both of such service contracts. In connection with the secured bank financing, the partners severally issued 50% guarantees. As of December 31, 2016 and 2015, the carrying value of the Company’s guaranty in the accompanying consolidated balance sheet was $0 . The charters under which the Company’s FSO Joint Venture vessels currently operate expire between July and September 2017. In December 2016 the FSO Joint Venture received a letter of award from the future operator of the Al Shaheen oil field for a five-year service contract relating to the two FSO service vessels, commencing at the expiry of their existing contracts. This award is subject to the successful negotiation and documentation of the services contracts, which is subject to the resolution of substantive business terms and conditions. The joint venture entered into floating-to-fixed interest rate swaps with major financial institutions. These agreements have maturity dates ranging from July to September 2017. The interest rate swaps, covering notional amounts aggregating $145,432 and $201,346 as of December 31, 2016 and 2015, respectively, pay fixed rates of approximately 3.9% and receive floating rates based on LIBOR. All of the interest rate swaps were being accounted for as cash flow hedges through December 31, 2009. As a result of the delays in the completion of conversion and commencement of the service contract for the FSO Africa, in the first quarter of 2010 the joint venture concluded that it was no longer probable that the forecasted transaction applicable to the FSO Africa swaps would occur. Accordingly, as a result of the de-designation of the FSO Africa swaps, all changes in the market value of the swaps have been recognized in the joint venture’s statement of operations since the first quarter of 2010. The Company’s share of amounts recognized in equity in income from affiliated companies for the years ended December 31, 2016, 2015 and 2014 were losses of $133 , $435 and $470 , respectively. As of December 31, 2016 and 2015, the joint venture had a liability of $2,236 and $7,203 , respectively, for the fair value of the swaps associated with the FSO Africa and FSO Asia. The Company’s share of the effective portion of such amounts, aggregating $111 and $1,334 at December 31, 2016 and 2015, respectively, is included in accumulated other comprehensive loss in the accompanying balance sheet and is associated with the FSO Asia swaps only, since the swaps associated with the FSO Africa have been de-designated and deemed to be ineffective. LNG Joint Venture In November 2004, the Company formed a joint venture with Qatar Gas Transport Company Limited (Nakilat) (“QGTC”) whereby companies in which OSG holds a 49.9% interest ordered four 216,200 cbm LNG Carriers. Upon delivery in late 2007 and early 2008, these vessels commenced 25 -year time charters to Qatar Liquefied Gas Company Limited (2) (‘‘LNG Charterer’’). QGTC subsequently contributed its ownership interests in the joint venture to its wholly owned subsidiary, Nakilat Marine Services Ltd. The aggregate construction cost for such newbuildings was financed by the joint venture through long-term bank financing that is nonrecourse to the partners and partner contributions. Approximately $638,827 and $678,132 was outstanding under this secured facility as of December 31, 2016 and 2015, respectively. The joint venture has entered into floating-to-fixed interest rate swaps with a group of major financial institutions pursuant to which it pays fixed rates of approximately 4.9% and receives a floating rate based on LIBOR. The interest rate swap agreements have maturity dates ranging from July to November 2022 and cover notional amounts aggregating $617,636 and $656,400 at December 31, 2016 and 2015, respectively. These swaps are being accounted for as cash flow hedges. As of December 31, 2016 and 2015, the joint venture recorded a liability of $80,458 and $103,262 , respectively, for the fair value of these swaps. The Company’s share of the effective portion of the fair value of these swaps, $40,076 and $51,467 at December 31, 2016 and 2015, respectively, is included in accumulated other comprehensive loss in the accompanying consolidated balance sheets.  Impairment of Equity Method Investments  In December 2016, evidence of an other-than-temporary decline in the fair value of the Company’s investments in its FSO Joint Venture below its carrying value was identified by the Company. Specifically, management concluded that the lower charter rate expected over the duration of the recently awarded five-year service contracts commencing in the third quarter of 2017 was negative evidence indicating that the excess of the carrying value of the Company’s investment in these joint ventures over their fair value was other-than-temporary as of December 31, 2016. As the Company determined that other-than-temporary impairments existed in relation to its investments in the FSO Joint Venture, impairment charges aggregating $30,475 were recorded to write down the investments to their estimated fair values as of December 31, 2016. In estimating the fair value of the Company’s investments in the FSO Joint Ventures as of December 31, 2016, the Company utilized an income approach by preparing discounted cash flow models since there is a lack of comparable market transactions for the specially built assets held by the FSO Joint Venture. In preparing the discounted cash flow models, the Company used a methodology largely consistent with the methodology and assumptions detailed in Note 6, “Vessels, Deferred Drydock and Other Property” above with the exception being that as the assets owned by the joint ventures serve under specific service contracts, the estimated charter rates for periods after the expiry of the existing contracts are based upon management’s internally forecasted rates. The cash flows were discounted using the current estimated weighted average cost of capital for each joint venture, which approximated 9.5% and took into consideration country risk, entity size and uncertainty with respect to the cash flows for periods beyond the current charter expiries.  Guarantees  As of December 31, 2016 and 2015, the affiliated companies in which the Company held an equity interest had total bank debt outstanding of $714,170 and $782,333 , respectively, of which $638,827 and $678,132 , respectively, was nonrecourse to the Company.  Currently, the FSO Joint Venture is party to a number of contracts to which INSW serves as guarantor. As of December 31, 2016, the maximum potential amount of future principal payments (undiscounted) that INSW could be required to make relating to equity method investees secured bank debt and interest rate swaps was $38,789 and the carrying amount of the liability related to this guarantee was $0 . See Note 13, “Related Parties,” for additional information relating to guarantees.  See Note 10, “Fair Value of Financial Instruments, Derivatives and Fair Value Disclosures,” and Note 15, “Accumulated Other Comprehensive Loss,” for additional disclosures relating to the FSO and LNG joint venture interest rate swap agreements.  Financial information for the equity method investees that were significant for the year ended December 31, 2016, adjusted for basis and accounting policy differences, is as follows:     For the year ended December 31, 2016 FSO Asia FSO Africa LNG Others Total  Shipping revenues $ 65,389 $ 65,515 $ 116,547 $ - $ 247,451  Ship operating expenses (29,290) (29,029) (56,195) - (114,514)  Income from vessel operations 36,099 36,486 60,352 - 132,937  Other income 106 15 709 - 830  Interest expense (4,948) (403) (37,660) - (43,011)  Net income 31,257 36,098 23,401 - 90,756   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  Equity in income/(loss) of affiliated companies, before  consolidating and reconciling adjustments $ 15,629 $ 18,049 $ 11,677 $ (28) $ 45,327   Impairment of equity method investments (15,977) (14,498) - - (30,475)  Amortization on deferred gain on 2009 sale  of TI Africa to FSO Joint Venture 1,202 1,207 - - 2,409  Amortization of interest capitalized during  vessel construction - - (419) - (419)  Other - - 7 - 7  Equity in income/(loss) of affiliated companies $ 854 $ 4,758 $ 11,265 $ (28) $ 16,849     For the year ended December 31, 2015 FSO Asia FSO Africa LNG Others Total  Shipping revenues $ 65,097 $ 65,528 $ 114,819 $ - $ 245,444  Ship operating expenses (29,467) (29,937) (54,235) - (113,639)  Income from vessel operations 35,630 35,591 60,584 - 131,805  Other income 38 9 2,311 - 2,358  Interest expense (6,348) (1,221) (39,650) - (47,219)  Net income 29,320 34,379 23,245 - 86,944   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  Equity in income/(loss) of affiliated companies, before  consolidating and reconciling adjustments $ 14,660 $ 17,190 $ 11,599 $ 113 $ 43,562   Amortization on deferred gain on 2009 sale  of TI Africa to FSO Joint Venture 1,202 1,207 - - 2,409  Amortization of interest capitalized during  vessel construction - - (419) - (419)  Other - - 8 (1) 7  Equity in income/(loss) of affiliated companies $ 15,862 $ 18,397 $ 11,188 $ 112 $ 45,559      For the year ended December 31, 2014 FSO Asia FSO Africa LNG Others Total  Shipping revenues $ 64,330 $ 64,611 $ 112,300 $ - $ 241,241  Ship operating expenses (30,172) (32,158) (55,837) - (118,167)  Income from vessel operations 34,158 32,453 56,463 - 123,074  Other income 88 23 94 - 205  Interest expense (7,699) (2,019) (41,622) - (51,340)  Net income 26,547 30,457 14,935 - 71,939   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  Equity in income/(loss) of affiliated companies, before  consolidating and reconciling adjustments $ 13,273 $ 15,228 $ 7,453 $ (79) $ 35,875   Amortization on deferred gain on 2009 sale  of TI Africa to FSO Joint Venture 1,202 1,207 - - 2,409  Amortization of interest capitalized during  vessel construction - - (419) - (419)  Other - - 1 6 7  Equity in income/(loss) of affiliated companies $ 14,475 $ 16,435 $ 7,035 $ (73) $ 37,872  The tables below present the financial position for the equity method investees that were significant in 2016 and a reconciliation of the Company’ s share of the joint ventures’ total equity to the investments in and advances to affiliates line on the consolidated balance sheet s as of December 31, 2016 and 2015:    As of December 31, 2016 FSO Asia FSO Africa LNG Other (1) Total  Cash and cash equivalents $ 23,013 $ 26,928 $ 25,844 $ - $ 75,785  Restricted cash, current portion 13,578 - 13,160 - 26,738  Trade receivables 10,891 10,955 853 - 22,699  Other receivables 407 331 54 - 792  Inventory - - 2,517 - 2,517  Total current assets 47,889 38,214 42,428 - 128,531  Restricted cash, long term portion - - 47,879 - 47,879  Trade receivables 9,824 9,005 - - 18,829  Vessels less accumulated depreciation 309,821 315,295 759,127 - 1,384,243  Deferred drydock expenditures, net - - 2,593 - 2,593  Total Assets $ 367,534 $ 362,514 $ 852,027 $ - $ 1,582,075   Accounts payable and accrued expenses $ 1,557 $ 804 $ 6,103 $ - $ 8,464  Current portion of long term debt 75,208 - 41,699 - 116,907  Current portion of derivative liability 969 1,268 22,545 - 24,782  Total current liabilities 77,734 2,072 70,347 - 150,153  Long-term debt - - 590,985 - 590,985  Long-term derivative liability - - 57,912 - 57,912  Advances from shareholders (2) 131,794 275,231 - - 407,025  Total Liabilities 209,528 277,303 719,244 - 1,206,075  Equity 158,006 85,211 132,783 - 376,000  Total Liabilities and Equity $ 367,534 $ 362,514 $ 852,027 $ - $ 1,582,075   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  INSW Share of affiliate's equity, before  consolidating and reconciling adjustments $ 79,003 $ 42,606 $ 66,259 $ - $ 187,868   Impairment of equity method investments (15,977) (14,498) - - (30,475)  Advances from shareholders 65,897 137,616 - - 203,513  Unamortized deferred gain on 2009 sale  of TI Africa to FSO Africa, net (18,089) (18,496) - - (36,585)  Unamortized interest capitalized during  vessel construction - - 10,693 10,693  Other - - (37) 23,704 23,667  Investments in and advances to affiliated companies $ 110,834 $ 147,228 $ 76,915 $ 23,704 $ 358,681  (1) Primarily relates to working capital deposits that the Company maintains with the commercial pools in which it participates. (2) Such advances are unsecured, interest free and not repayable within one year .     As of December 31, 2015 FSO Asia FSO Africa LNG Other (1) Total  Cash and cash equivalents $ 16,413 $ 880 $ 14,031 $ - $ 31,324  Restricted cash, current portion 14,052 - 13,370 - 27,422  Trade receivables 10,817 10,881 655 - 22,353  Other receivables 466 391 203 - 1,060  Inventory - - 2,148 - 2,148  Total current assets 41,748 12,152 30,407 - 84,307  Restricted cash, long term portion - - 46,199 - 46,199  Trade receivables 7,847 6,895 - - 14,742  Vessels less accumulated depreciation 328,719 334,247 785,523 - 1,448,489  Deferred drydock expenditures, net - - 6,266 - 6,266  Total Assets $ 378,314 $ 353,294 $ 868,395 $ - $ 1,600,003   Liabilities and equity  Current liabilities:  Accounts payable and accrued expenses $ 1,731 $ 797 $ 7,634 $ - $ 10,162  Amounts due to related companies 247 366 - - 613  Current portion of long term debt 28,616 - 39,305 - 67,921  Current portion of derivative liability 2,556 2,541 26,307 - 31,404  Total current liabilities 33,150 3,704 73,246 - 110,100  Long-term debt 75,208 - 631,655 - 706,863  Long-term derivative liability 861 1,246 76,955 - 79,062  Advances from shareholders (2) 144,794 299,231 - - 444,025  Total Liabilities 254,013 304,181 781,856 - 1,340,050  Equity 124,301 49,113 86,539 - 259,953  Total Liabilities and Equity $ 378,314 $ 353,294 $ 868,395 $ - $ 1,600,003   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  INSW Share of affiliate's equity, before  consolidating and reconciling adjustments $ 62,151 $ 24,557 $ 43,183 $ - $ 129,891   Advances from shareholders 72,397 149,616 - - 222,013  Unamortized deferred gain on 2009 sale  of TI Africa to FSO Africa, net (19,292) (19,703) - - (38,995)  Unamortized interest capitalized during  vessel construction - - 11,112 - 11,112  Other - - (36) 20,906 20,870  Investments in and advances to affiliated companies $ 115,256 $ 154,470 $ 54,259 $ 20,906 $ 344,891  (1) Primarily relates to working capital deposits that the Company maintains with the commercial pools in which it participates. (2) Such advances are unsecured, interest free and not repayable within one year .  The tables below present the cash flows for the equity method investees that were significant in 2016 for each of the three years ended December 31, 2016:     Statements of cash flows of FSO Asia for the year ended December 31, 2016 2015 2014   Net cash provided by operating activities $ 47,984 $ 63,813 $ 41,795   Cash flows from investing activities:  Change in restricted cash 474 (35) (29)  Decrease in amounts due from related companies - - 30,000  Net cash provided by/(used in) investing activities 474 (35) 29,971   Cash flows from financing activities:  Repayment of bank loan (28,858) (27,446) (26,103)  Repayment of advances from shareholders (13,000) (37,000) (60,000)  Net cash used in financing activities (41,858) (64,446) (86,103)   Net increase/(decrease) in cash and cash equivalents 6,600 (668) (14,337)  Cash and cash equivalents at beginning of year 16,413 17,081 31,418  Cash and cash equivalents at end of year $ 23,013 $ 16,413 $ 17,081      Statements of cash flows of FSO Africa for the year ended December 31, 2016 2015 2014   Net cash provided by operating activities $ 50,048 $ 48,131 $ 38,224   Cash flow from investing activities:  Change in restricted cash - 13,080 (24)  Net cash provided by/(used in) investing activities - 13,080 (24)   Cash flows from financing activities:  Decrease in amounts due to related companies - (17,520) (30,000)  Repayment of bank loan - (13,750) (25,000)  Repayment of advances from shareholders (24,000) (38,000) -  Net cash used in financing activities (24,000) (69,270) (55,000)   Net increase/(decrease) in cash and cash equivalents 26,048 (8,059) (16,800)  Cash and cash equivalents at beginning of year 880 8,939 25,739  Cash and cash equivalents at end of year $ 26,928 $ 880 $ 8,939      Statements of cash flows of LNG Joint Venture for the year ended December 31, 2016 2015 2014   Net cash provided by operating activities $ 52,587 $ 56,012 $ 45,287   Cash flow from investing activities:  Change in restricted cash (1,469) (1,927) (1,469)  Net cash used in investing activities (1,469) (1,927) (1,469)   Cash flows from financing activities:  Repayment of bank loan (39,305) (37,246) (35,198)  Cash dividends paid - (12,000) (10,000)  Net cash used in financing activities (39,305) (49,246) (45,198)   Net increase/(decrease) in cash and cash equivalents 11,813 4,839 (1,380)  Cash and cash equivalents at beginning of year 14,031 9,192 10,572  Cash and cash equivalents at end of year $ 25,844 $ 14,031 $ 9,192 

VARIABLE INTEREST ENTITIES ("VI

VARIABLE INTEREST ENTITIES ("VIEs")	12 Months Ended
	Dec. 31, 2016
Variable Interest Entities ("VIEs") [Abstract]
Variable Interest Entities ("VIEs")	NOTE 8 —VARIABLE INTEREST ENTITIES (“VIEs”): At December 31, 2016, the Company participates in six commercial pools and three joint ventures. Commercial pools operate a large number of vessels as an integrated transportation system, which offers customers greater flexibility and a higher level of service while achieving scheduling efficiencies. Participants in the commercial pools contribute one or more vessels and generally provide an initial contribution towards the working capital of the pool at the time they enter their vessels. The pools finance their operations primarily through the earnings that they generate. INSW enters into joint ventures to take advantage of commercial opportunities. INSW entities have entered into joint ventures with different partners (see Note 7, “Equity Method Investments”). In each joint venture, the INSW entities have the same relative rights and obligations and financial risks and rewards as its partners. INSW evaluated all nine arrangements to determine if they were variable interest entities (“VIEs”). INSW determined that one of the pools and two of the joint ventures met the criteria of a VIE and, therefore, INSW reviewed its participation in these VIEs to determine if it was the primary beneficiary of any of them.  INSW reviewed the legal documents that govern the creation and management of the VIEs described above and also analyzed its involvement to determine if INSW was a primary beneficiary in any of these VIEs. A VIE for which INSW is determined to be the primary beneficiary is required to be consolidated in its financial statements.  The formation agreements for the commercial pool state that the board of the pool has decision making power over their significant decisions. In addition, all such decisions must be approved unanimously by the board. Since INSW shares power to make all significant economic decisions that affect the pool and does not control a majority of the board, INSW is not considered a primary beneficiary of the pool.  The FSO joint venture s described in Note 7, “Equity Method Investments,” w ere determined to be VIE s . The formation agreements of the joint venture s state that all significant decisions must be approved by the majority of the board. As a result, INSW shares power to make all significant economic decisions that affect this joint venture and does not control a majority of the board and is not considered a primary beneficiary. Accordingly, INSW accounts for th ese investment s under the equity method of accounting.  The joint ventures ’ formation agreements require INSW and its joint venture partner to provide financial support as needed. INSW has provided and will continue to provide such support as described in Note 7, “Equity Method Investments.”  The following table presents the carrying amounts of assets and liabilities in the consolidated balance sheets related to the VIEs described above as of December 31, 2016 and 2015:      Consolidated Balance Sheet as of December 31, 2016 2015  Investments in Affiliated Companies $ 261,403 $ 271,618 In accordance with accounting guidance, the Company evaluated its maximum exposure to loss related to these VIEs by assuming a complete loss of the Company’s investment in and advances to these VIEs and that it would incur an obligation to repay the full amount of the VIE’s outstanding secured debt and swap liabilities. The table below compares the Company’s liability in the consolidated balance sheet to the maximum exposure to loss at December 31, 2016:         Consolidated Balance Sheet Maximum Exposure to Loss  Other Liabilities $ - $ 300,200  In addition, as of December 31, 2016, the Company had approximately $9,985 of trade receivables from pools that were determined to be VIEs. These trade receivables, which are included in voyage receivables in the accompanying consolidated balance sheet, have been excluded from the above tables and the calculation of INSW’s maximum exposure to loss. The Company does not record the maximum exposure to loss as a liability because it does not believe that such a loss is probable of occurring as of December 31, 2016. Further, the joint venture debt is secured by the joint venture’s FSOs. Therefore, the Company’s exposure to loss under its several guarantee would first be reduced by the fair value of such FSOs.

DEBT

DEBT	12 Months Ended
	Dec. 31, 2016
Debt [Abstract]
Debt	NOTE 9 —DEBT:  Debt consists of the following:      As of December 31, 2016 2015  INSW Term Loan, due 2019, net of unamortized discount  and deferred finance costs of $20,311 and $23,727 $ 439,651 $ 595,222  Less current portion (6,183) (6,284)  Long-term portion $ 433,468 $ 588,938  INSW Facilities Capitalized terms used hereafter have the meaning given in these consolidated financial statements or in the respective transaction documents referred to below, including subsequent amendments thereto. As discussed in Note 2, “Chapter 11 Filing and Emergence from Bankruptcy,” the INSW Facilities include the INSW Term Loan and INSW Revolver Facility — a secured term loan facility of $628,375 and a revolving loan facility of $50,000 . As of December 31, 2016, no amounts had been drawn under the INSW Revolving Facility.  The INSW Facilities, as amended by the a mendment s discussed below, provide that the borrowers thereunder may request an increase of the term loan and revolving loan commitments by an amount which may not exceed, collectively, the greater of (i) $75,000 and an additional amount, if, after giving effect to the increase of such additional amount, on a Pro Forma Basis, INSW is in compliance with a stated ratio for the Test Period most recently ended for which financial statements have been delivered to the Administrative Agent, provided that among other terms and conditions, (a) no Default shall have occurred and be continuing or would occur after giving effect to such commitment increase and (b) immediately after giving effect to such increase, INSW shall be in compliance with the Loan to Value Test. However, no Lender is obligated to increase the amount of their loan commitment thereunder, and the borrowers thereunder may not obtain more than a $200,000 increase in the aggregate of Incremental Term Loans and Incremental Revolving Commitments.  Interest on the INSW Facilities is calculated, at the Company’s option, based upon (i) an alternate base rate (“ABR”) plus the applicable margin or (ii) Adjusted LIBOR plus the applicable margin. ABR is defined as the highest of (i) the Base Rate ( i.e. , the prime rate published in The Wall Street Journal ), (ii) the Federal Funds Effective Rate plus 0.50% , (iii) the one-month Adjusted LIBOR Rate plus 1.00% and (iv) 2.00% per annum. The INSW Revolver Facility provides for quarterly payment of commitment fees at a rate of 0.50% of the average daily unused amount of each lender’s Revolving Commitments.  The applicable margins and floor interest rates for each INSW Exit Financing Facility is as follows:    Facility INSW Term Loan INSW Revolver Facility  Rate ABR LIBOR ABR LIBOR  Floor 2.00% 1.00% 2.00% 1.00%  Applicable Margin 3.75% 4.75% 3.50% 4.50%  The INSW Term Loan amortizes in equal quarterly installments in aggregate annual amounts equal to 1.00% of the original principal amount of the loan, adjusted for optional and mandatory pre-payments. Each of the INSW Facilities stipulates if annual aggregate net cash proceeds of asset sales exceed $5,000 , net cash proceeds from each such sale are required to be reinvested in fixed or capital assets within twelve months of such sale or be used to prepay the principal balance outstanding of the respective facility. The INSW Term Loan is subject to additional mandatory annual prepayments in an aggregate principal amount of up to 50% of Excess Cash Flow. As set forth in the INSW Facilities loan agreements, the INSW Facilities contain certain restrict ions relating to new borrowings and the movement of funds between INSW subsidiaries that are Restricted Subsidiaries and INSW; in addition, prior to the Fourth INSW Credit Agreement Amendment, the movement of funds between the borrowers and OSG (as the former parent of INSW) was restricted. INSW’s ability to receive cash dividends, loans or advances from its subsidiaries that are Restricted Subsidiaries is restricted (and OSG’s ability to receive cash dividends, loans or advances from INSW was restricted prior to the Fourth INSW Credit Agreement Amendment ) .  The Available Amount for cash dividends permitted under the INSW Term Loan was $30,200 as of December 31, 2016, after INSW’s dividend distributions to OSG of $102,000 during the year ended December 31, 2016. Management expects that the Available Amount will increase to $70,236 by the end of the first quarter of 2017, after the required reports are filed with the banks. The INSW Facilities have a covenant to maintain the aggregate Fair Market Value (as defined in the loan agreement for the INSW Facilities) of the Collateral Vessels at greater than or equal to $500,000 at the end of each fiscal quarter. The Company had substantial headroom under this covenant at December 31, 2016. The INSW Term Loan matures on August 5, 2019 and the INSW Revolver Facility matures on February 5, 2019 . The maturity dates for the INSW Facilities are subject to acceleration upon the occurrence of certain events, as defined in the loan agreement.  During the years ended December 31, 2016 and 2015, the Company paid deferred financing fees of $8,273 and $5,545 in connection with amendments to the INSW Facilities described above. Such fees were capitalized as deferred finance charges. (See Note 3 , “Significant Accounting Policies,” for additional information relating to deferred financing charges). During the year ended December 31, 2014, the Company paid issuance and deferred financing fees aggregating $1,153 and $26,616 , respectively, for the INSW Facilities. Issuance costs incurred by the Exit Facilities lenders (“Exit Facilities Lenders”), or on behalf of the Exit Facilities Lenders, have been treated as a reduction of the debt proceeds.  As of December 31, 2016, the aggregate annual principal payments required to be made on the INSW Term Loan are as follows:      Year Amount  2017 $ 6,183  2018 6,183  2019 447,596  Aggregate principal payments required $ 459,962  The following table summarizes interest expense, including amortization of issuance and deferred financing costs, commitment, administrative and other fees, recognized during the years ended December 31, 2016, 2015 and 2014 with respect to the Company’s debt facilities:     Debt facility 2016 2015 2014  Contractual Interest Contractual Interest Contractual Interest Reorganization Expense Total Expense  INSW Facilities, due 2019 $ 38,442 $ 42,688 $ 17,085 $ - $ 17,085  Co-borrower obligation under the unsecured  revolving credit facility (1) - - 11,155 - 11,155  Floating rate secured term loans, due through 2023 (1) - - 20,460 10,083 30,543  Total INSW Facilities interest expense $ 38,442 $ 42,688 $ 48,700 $ 10,083 $ 58,783    (1) The Company repaid the principal outstanding of $217,000 for the co -borrower obligation under the unsecured revolving credit f acility and the Company and OSG repaid principal outstanding amounts of $110,000 and $468,687 , respectively, for the floating rate secured term loans (collectively, the pre-reorganized INSW loan facilities) on the Effective Date.  The amounts recognized during the year ended December 31, 2014 reflect contractual interest expense (including default interest, as applicable) and reorganization items relating to default interest and changes in estimates of allowed claims, as applicable, pursuant to the Equity Plan.  The following table summarizes interest paid, excluding deferred financing fees paid, capitalized interest and amounts paid under the related party loan agreements (See Note 13, “Related Parties”), during the years ended December 31, 2016, 2015 and 2014 with respect to the Company’s debt facilities:     Debt facility 2016 2015 2014  INSW Facilities, due 2019 $ 33,039 $ 36,368 $ 9,239  Co-borrower obligation under the unsecured revolving credit facility - - 11,496  Floating rate secured term loans, due through 2023 (1) - - 10,314  Total debt related interest expense paid (2) $ 33,039 $ 36,368 $ 31,049  (1) Additionally, OSG paid approximately $838 of interest for the year ended December 31, 2014 relating to its guarantee of the floating rate secured loans, which was deemed a capital contribution for financial reporting purposes. (2) For the year ended December 31, 2014, excludes contractual interest the Company paid of $7,453 and $117 relating to the rejected charters (See Note 16, "Leases") and other obligations, respectively.  Debt Modifications, Repurchases and Extinguishments  On June 3, 2015, the Company entered into the first amendment to the INSW Facilities. The amendment to the INSW Facilities among other things, provided for the following, subject to certain conditions described therein: (i) it permitted the Company to pay a cash dividend of up to $200,000 to OSG no later than June 30, 2015; (ii) it permitted the Company to retain net cash proceeds of up to $78,000 from the sales of certain assets that occurred prior to June 3, 2015; and (iii) it altered the periods during which Excess Cash Flow (as defined in the loan agreement for the INSW Facilities) must be used to prepay the outstanding balance of the INSW Facilities, from an annual period beginning January 1, 2015 to a six-month period beginning July 1, 2015 and annual periods thereafter.  On July 18, 2016, the Company entered into a second amendment (the “Second INSW Credit Agreement Amendment”) to the INSW Facilities. The Second INSW Credit Agreement Amendment, among other things, amended the conditions under which the INSW Facilities permitted OSG to spin off INSW. In particular, the Second INSW Credit Agreement Amendment permitted the distribution of OSG’s equity interests in INSW to OSG’s shareholders in conjunction with the transfer of substantially all of INSW’s assets (subject to certain exceptions) to a new wholly-owned subsidiary of INSW, subject to the satisfaction of other conditions set forth in the INSW Facilities and the Second INSW Credit Agreement Amendment. On September 20, 2016, the Company entered into a third amendment (the “Third INSW Credit Agreement Amendment”) to the INSW Facilities. The Third INSW Credit Agreement Amendment, among other things, (i) permitted INSW to dividend up to an aggregate amount of $100,000 to OSG prior to October 14, 2016; (ii) reduced the maximum amount of Incremental Term Loans and Incremental Revolving Loans (as defined in the INSW Facilities) the Borrowers may obtain under the INSW Facilities to $200,000 and altered certain conditions for providing such loans; (iii) increased the amount of certain investments the Company and its subsidiaries may make under the INSW Facilities; and (iv) required the Company to prepay outstanding Initial Term Loans in an aggregate principal amount equal to $75,000 substantially simultaneously with the effective date of the Third INSW Credit Agreement Amendment. The dividend distribution of $100,000 to OSG and the $75,000 prepayment of the outstanding principal balance of the INSW Term Loan were completed as of September 30, 2016. On November 30, 2016, the Company entered into a fourth amendment (the “Fourth INSW Credit Agreement Amendment”) to the INSW Facilities primarily to reflect the spin-off of the Company from OSG. The Fourth INSW Credit Agreement Amendment, among other things, (i) removed OSG as guarantor of and party under the facility; (ii) replaced restrictions on the movement of funds to OSG with limitations on the use of the Available Amount to pay dividends to shareholders ; (iii) restricted payments of dividends from INSW’s subsidiaries to INSW; and (iv ) added or modified certain definitions. During the year ended December 31, 2016, the Company made repurchases of the INSW Term Loan in the open market of $68,922 and mandatory principal prepayments of $83,832 . The net loss of $1,342 realized on these transactions for the year ended December 31, 2016 is included in other (expense)/income in the consolidated statement of operations. The net loss reflects a $5,097 write-off of unamortized original issue discount and deferred financing costs associated with the principal reductions, which were treated as partial extinguishments. Third party legal and consulting fees (aggregating $225 ) incurred by the Company in relation to the open market repurchases and INSW Term Loan amendments are included in general and administrative expenses in the consolidated statement of operations for the year ended December 31, 2016. Management determined that no prepayment is required for the INSW Term Loan as of December 31, 2016.

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES	12 Months Ended
	Dec. 31, 2016
Fair Value of Financial Instruments, Derivatives and Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments, Derivatives and Fair Value Disclosures	NOTE 10 — FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES:  The following methods and assumptions were used to estimate the fair value of each class of financial instrument. Cash and cash equivalents and restricted cash— The carrying amounts reported in the consolidated balance sheets for interest-bearing deposits approximate their fair value. Debt— The fair values of the Company’s debt is estimated based on quoted market prices.  Interest rate swaps and caps— The fair values of interest rate swaps and caps are the estimated amounts that the Company would receive or pay to terminate the swaps or caps at the reporting date, which include adjustments for the counterparty or the Company’s credit risk, as appropriate, after taking into consideration any underlying collateral securing the swap or cap agreements. ASC 820, Fair Value Measurements and Disclosures , relating to fair value measurements, defines fair value and established a framework for measuring fair value. The ASC 820 fair value hierarchy distinguishes between market participant assumptions developed based on market data obtained from sources independent of the reporting entity and the reporting entity's own assumptions about market participant assumptions developed based on the best information available in the circumstances. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, essentially an exit price. In addition, the fair value of assets and liabilities should include consideration of non-performance risk, which for the liabilities described below includes the Company's own credit risk. The levels of the fair value hierarchy established by ASC 820 are as follows: Level 1—Quoted prices in active markets for identical assets or liabilities Level 2—Quoted prices for similar assets and liabilities in active markets or inputs that are observable Level 3—Inputs that are unobservable (for example cash flow modeling inputs based on assumptions)  The estimated fair values of the Company’s financial instruments, other than derivatives that are not measured at fair value on a recurring basis, categorized based upon the fair value hierarchy, at December 31, 2016 and 2015, are as follows:      Fair Value Level 1 Level 2  December 31, 2016:  Cash $ 92,001 $ 92,001 $ -  INSW Term Loan (447,888) - (447,888)   December 31, 2015:  Cash (1) $ 317,847 $ 317,847 $ -  INSW Term Loan (601,928) - (601,928)  (1) Includes non-current restricted cash aggregating $8,989 at December 31, 2015.  Derivatives The Company manages its exposure to interest rate volatility risks by using derivative instruments. Interest Rate Risk The Company uses interest rate caps and swaps for the management of interest rate risk exposure. As of December 31, 2016 and 2015, the Company was party to an interest rate cap agreement (“Interest Rate Cap”) with a start date of February 15, 2015 with major financial institutions covering a notional amount of $400,000 to limit the floating interest rate exposure associated with the INSW Term Loan. The interest rate cap was designated and qualified as a cash flow hedge. This agreement contains no leverage features. The Interest Rate Cap has a Cap Rate of 2.5% through the termination date of February 5, 2017 .  Tabular disclosure of derivatives location  D erivatives are recorded in the balance sheet on a net basis by counterparty when a legal right of offset exists. The following tables present information with respect to the fair values of derivatives reflected in the December 31, 2016 and 2015 balance sheets on a gross basis by transaction: Fair Values of Derivative Instruments:     Asset Derivatives Liability Derivatives  Balance Sheet Balance Sheet  Location Amount Location Amount  December 31, 2016:  Derivatives designated as hedging instruments:  Interest rate cap:  Current portion Other assets $ - Other liabilities $ -  Total derivatives designated as hedging instruments $ - $ -   December 31, 2015:  Derivatives designated as hedging instruments:  Interest rate cap:  Long-term portion Other assets $ 2 Other liabilities $ -  Total derivatives designated as hedging instruments $ 2 $ -  The following tables present information with respect to gains and losses on derivative positions reflected in the consolidated statements of operations or in the consolidated statements of other comprehensive income/(loss). The effect of cash flow hedging relationships recognized in other comprehensive income/(loss) excluding amounts reclassified from accumulated other comprehensive loss (effective portion), including hedges of equity method investees, for the years ended December 31, 2016, 2015 and 2014 follows:     For the year ended December 31, 2016 2015 2014  Interest rate swaps $ (3,050) $ (9,721) $ (21,487)  Interest rate cap (2) (472) (172)  Total $ (3,052) $ (10,193) $ (21,659)  The effect of cash flow hedging relationships on the consolidated statements of operations is presented excluding hedges of equity method investees. The Company’s interest rate cap agreements had no effect on the consolidated statement of operations for the year ended December 31, 2014. The effect of the Company’s cash flow hedging relationships on the consolidated statement of operations for the years ended December 31, 2016 and 2015 is shown below:      Statement of Operations  Effective Portion of Gain/(Loss)  Reclassified from Accumulated  Other Comprehensive Loss Ineffective Portion  Amount of Amount of  Location Gain/(Loss) Location Gain/(Loss)  For the year ended December 31, 2016:  Interest rate cap Interest expense $ (517) Interest expense $ -  Total $ (517) $ -   For the year ended December 31, 2015:  Interest rate cap Interest expense $ (2) Interest expense $ -  Total $ (2) $ -      See Note 7, “Equity Method Investments,” for additional information relating to derivatives held by the Company’s equity method investees and Note 15, “Accumulated Other Comprehensive Loss,” for disclosures relating to the impact of derivative instruments on accumulated other comprehensive loss.  Fair Value Hierarchy  The following table presents the fair values, which are pre-tax, for assets and liabilities measured on a recurring basis (excluding investments in affiliated companies):     Fair Value Level 2  Assets/(Liabilities) at December 31, 2016  Derivative Assets (interest rate cap) $ - $ - (1)   Assets/(Liabilities) at December 31, 2015  Derivative Assets (interest rate cap) $ 2 $ 2 (1) (1) For the interest rate cap, fair value is derived using valuation models that utilize the income valuation approach. These valuation models take into account contract terms such as maturity, as well as other inputs such as interest rate yield curves and creditworthiness of the counterparty and the Company. The following table summarizes the fair values of assets for which an impairment charge was recognized for the year ended December 31, 2016:     Impairment  Description Fair Value Level 2 Level 3 Charges  International Crude Tankers - Vessels held and used (1) (2) $ 38,828 $ 28,875 $ 9,953 $ (7,786)  International Product Carriers - Vessels held and used (1) (2) $ 89,557 $ 40,000 $ 49,557 $ (71,456)  International Crude Tankers - Equity method investments (3) $ 258,061 $ - $ 258,061 $ (30,475)  (1) Aggregate pre-tax impairment charges of $49,640 related to two vessels in each of the International Crude Tanker and International Product Carriers segments and $29,602 related to one vessel in the International Crude Tanker segment and seven vessels in the International Product Carriers segment were recorded during the three-month periods ended September 30, 2016 and December 31, 2016, respectively. (2) Fair value measurements aggregating $59,510 at December 31, 2016 used to determine the impairment for eight vessels were based on the income approach, which utilized cash flow projections consistent with the most recent projections of the Company and a discount rate equivalent to INSW's weighted average cost of capital. Because the Company uses its own cash flow projections, the cash flow projections are considered to be Level 3. The fair value measurements of $68,875 at September 30, 2016 used to determine impairment for four vessels were based upon a market approach, which considered the expected sales prices of vessels obtained from vessel appraisals. Because sales of vessels occur somewhat infrequently the expected sales prices are considered to be Level 2. (3) Aggregate pre-tax impairment charges of $30,475 related to the Company’s investments in the FSO joint ventures, which are accounted for using the equity method, were recorded during the three-month period ended December 31, 2016. The fair value measurement of $258,061 at December 31, 2016 used to determine the amount of the impairment was based on the income approach, which utilized cash flow projections consistent with the most recent projections of the Company, and a discount rate equivalent to a market participant's weighted average cost of capital. Because the Company uses its own cash flow projections, the cash flow projections are considered to be Level 3.

ACCOUNTS PAYABLE, ACCRUED EXPEN

ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES	12 Months Ended
	Dec. 31, 2016
ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES [Abstract]
ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES	NOTE 11 — ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES:      At December 31, 2016 2015  Accounts payable $ 2,866 $ 3,371  Payroll and benefits 5,672 2,154  Interest 4,042 5,636  Due to owners on chartered in vessels 856 2,141  Accrued drydock and repairs 1,608 2,127  Bunkers and lubricants 2,787 820  Charter revenues received in advance 6,725 1,227  Insurance 2,650 1,517  Accrued vessel expenses 6,804 9,086  Accrued general and administrative expenses 2,644 1,107  Other 1,583 1,597  Total accounts payable, accrued expense and other current liabilities $ 38,237 $ 30,783 

TAXES

TAXES	12 Months Ended
	Dec. 31, 2016
Taxes [Abstract]
Taxes	NOTE 12 —TAXES:  Income taxes are provided using the asset and liability method, such that income taxes are recorded based on amounts refundable or payable in the current year and include the results of any differences in the basis of assets and liabilities between U.S. GAAP and tax reporting. Income taxes are calculated on a separate return basis and t here has been no allocation of income taxes from OSG . The Company derives substantially all of its gross income from the use and operation of vessels in international commerce. The Company’s entities that own and operate vessels are primarily domiciled in the Marshall Islands, which does not impose income tax on shipping operations. The Company also has or had subsidiaries in various jurisdictions that performed administrative, commercial or technical management functions. These subsidiaries are subject to income taxes based on the services performed in countries in which those particular offices are located and, accordingly, current and deferred income taxes are recorded. INSW also had entities in Greece that were exclusively engaged in management of INSW vessels and were statutorily exempt from Greek income tax on their shipping income.  Under current U.S. tax laws, INSW was a control led foreign corporation (“CFC”) for 2016 since OSG wa s a U.S. shareholder of INSW. INSW, including its subsidiaries, which are disregarded entities for U.S. Federal income tax purposes, is exempt from taxation on its U.S. source shipping income under Section 883 of the U.S. Internal Revenue Code of 1986, as amended (the “Code”) and U.S. Treasury Department regulations. Under Section 883 of the Code and U.S. Treasury Department regulations, INSW qualifie d for this exemption so long as, for more than half of the days in its taxable year, it wa s a CFC and more than 50 percent of the total value of its stock wa s owned by OSG or certain other U.S. persons. Beginning in 2017, t o the extent INSW is unable to qualify for exemption from tax under Section 883, INSW will be subject to U.S. federal taxation of 4% of its U.S. source shipping income on a gross basis without the benefit of deductions. Shipping income that is attributable to transportation that begins or ends, but that does not both begin and end, in the U.S. will be considered to be 50% derived from sources within the U.S. Shipping income attributable to transportation that both begins and ends in the U.S. will be considered to be 100% derived from sources within the U.S. INSW does not engage in transportation that gives rise to 100% U.S. source income. Shipping income attributable to transportation exclusively between non-U.S. ports will be considered to be 100% derived from sources outside the U.S. Shipping income derived from sources outside the U.S. will not be subject to any U.S. federal income tax. INSW’s vessels operate in various parts of the world, including to or from U.S. ports. There can be no assurance that INSW will continue to qualify for the Section 883 exemption.  A substantial portion of income earned by INSW is not subject to income tax, and no deferred taxes are provided on the temporary differences between the tax and financial statement basis of the underlying assets and liabilities for those subsidiaries not subject to income tax in their respective countries of incorporation.  The Marshall Islands and Greece impose tonnage taxes, which are assessed on the tonnage of certain of the Company’s vessels. These tonnage taxes are included in vessel expenses in the accompanying consolidated statements of operations.  The components of the income tax provisions follow:      For the year ended December 31, 2016 2015 2014  Current $ 440 $ 140 $ 754  Deferred - - (10)  Total provision for income taxes $ 440 $ 140 $ 744  During the year ended December 31, 2014, OSG made certain payments in connection with its Emergence, aggregating $477,835 , in its capacity as guarantor of the obligations of subsidiaries of INSW with respect to two term loans. For income tax purposes, INSW presented these payments as cancellation of indebtedness income. The differences between income taxes expected at the Marshall Islands statutory income tax rate of zero percent and the reported income tax provisions are summarized as follows:     For the year ended December 31, 2016 2015 2014  Marshall Islands statutory income tax rate - % - % - %  Change in valuation allowance 25.29 % - % 0.04 %  Liquidation of subsidiaries (29.53) % - % - %  Income subject to tax in other jurisdictions 1.76 % 0.08 % 0.59 %  Effective income tax rate (2.48) % 0.08 % 0.63 %  The significant components of the Company’s deferred tax liabilities and assets follow:     As of December 31, 2016 2015  Deferred tax assets:  Net operating loss carryforwards 1,711 6,714  Excess of tax over book basis of depreciable assets 548 666  Pensions 3,147 2,519  Other - 5  Total deferred tax assets 5,406 9,904  Less: Valuation allowance (5,406) (9,904)  Deferred tax assets, net - -  Net noncurrent deferred tax assets/(liabilities) $ - $ -  As of December 31, 2016 and 2015, the Company had net operating loss carryforwards of $42,001 and $66,499 , respectively. Of the net operating losses as of December 31, 2016, $4,558 have an indefinite life and $37,443 expire between 2018 and 2023 .  The Company believes that it is more likely than not that the benefit from its net operating loss carryforwards and certain other deferred tax assets will not be realized and has maintained a valuation allowance of $5,406 and $9,904 , respectively, as of December 31, 2016 and 2015. If or when recognized, the tax benefits related to any reversal of the valuation allowance on deferred tax assets will be accounted for as a reduction of income tax expense in the period such reversal occurs. During 2016, the Company decreased its valuation allowance by $4,498 primarily as a result of the liquidation of certain subsidiaries .  The following is tabular rollforward of the Company’s unrecognized tax benefits (excluding interest and penalties):     2016 2015  Balance of unrecognized tax benefits as of January 1, $ 40 $ 170  Increases for positions taken in prior years 115 -  Decreases for positions taken in prior years - (130)  Changes due to currency translations (2) -  Balance of unrecognized tax benefits as of December 31, $ 153 $ 40 The Company records interest on unrecognized tax benefits in its provision for income taxes. Accrued interest is included in other current liabilities in the consolidated balance sheets. As of December 31, 2016 and 2015, the Company has recognized a total liability for interest of $33 and $22 , respectively. INSW has recorded the unrecognized tax benefits in other current liabilities in the consolidated balance sheets. If recognized, all of the December 31, 2016 balance of unrecognized tax benefits would affect the effective tax rate. Management believes that it is reasonably possible that a decrease of up to $94 in unrecognized tax benefits related to issues currently under examination by the taxing authorities will be settled during 2017 .

RELATED PARTIES

RELATED PARTIES	12 Months Ended
	Dec. 31, 2016
RELATED PARTIES [Abstract]
RELATED PARTIES	NOTE 13 —RELATED PARTIES:  The following tables show certain related party transactions between INSW and OSG:     For the year ended December 31, 2016 2015 2014  Corporate overhead allocations from OSG  General and administrative $ 21,486 $ 36,792 $ 39,570  Depreciation 517 730 1,022  Technical management transition costs - - 21  Separation and transition costs 6,569 - 670  Reorganization items, net 131 5,659 86,179  Total corporate overhead allocations from OSG $ 28,703 $ 43,181 $ 127,462  The outstanding amounts related to the transactions between INSW and OSG were as follows:    As of December 31, 2016 2015  Payable to OSG $ 683 $ 11,350 Payables to OSG as of December 31, 2016 are primarily in relation to the spin-related agreements described below. Transition Services Agreement and Other Spin-off Related Activity INSW entered into a separation and distribution agreement (the “Separation and Distribution Agreement”) with OSG, which among other things, (i) governs the transfer of assets and liabilities between both entities, (ii) terminates all intercompany arrangements between INSW and OSG except for specified agreements and arrangements, (iii) contains terms and conditions that generally require INSW and OSG to use commercially reasonable efforts to consummate the transactions contemplated by the Separation and Distribution Agreement and the ancillary agreements, (iv) releases certain claims between the parties and their affiliates, successors and assigns, (v) contains mutual indemnification provisions and (vi) allocates expenses of the spin-off between the parties. Spin-off related costs incurred by INSW pursuant to the Separation and Distribution Agreement aggregated $9,043 . Approximately $3,337 of these costs represented INSW’s allocated share of severance costs for certain individuals that departed OSG in conjunction with the spin-off of INSW. While comparable costs are not expected in 2017, both parties will perform a true up of final separation costs which may result in additional costs being incurred by INSW in 2017. INSW and OSG also entered into a transition services agreement (the “TSA” or “Transition Services Agreement”) pursuant to which both parties agreed to provide each other with specified services for a limited time to help ensure an orderly transition following the Distribution. The Transition Services Agreement specifies the calculation of the costs for these services. Pursuant to the terms of the agreement, OSG will provide certain administrative services, including administrative support services related to benefit plans, human resources and legal services, for a transitional period after the spin-off. Similarly, INSW has agreed to provide certain limited transition services to OSG, including services relating to accounting activities and information and data provision services. The Transition Services Agreement will terminate 30 days after the expiration or termination of all of the services provided thereunder, which are generally provided for a maximum period of three to six months. INSW expects to earn fees totaling $79 for services provided to OSG pursuant to the terms of the Transition Services Agreement over the six-month term of the TSA. Approximately $27 of such fees were earned as of December 31, 2016. OSG also expects to incur fees totaling $156 during the term of the TSA for services received from OSG. Approximately $31 of such fees were incurred as of December 31, 2016.  INSW and OSG also entered into an employee matters agreement (the “Employee Matters Agreement”), which addresses the allocation and treatment of assets and liabilities relating to employees and compensation and benefit plans and programs in which INSW employees participated, including equity incentive plans. The Employee Matters Agreement also governs the transfer of employees between OSG and INSW in connection with the Distribution, and set forth certain obligations for reimbursements and indemnities between OSG and INSW.  Corporate Overhead Allocations from OSG  During the periods presented, the Company benefited from certain corporate functions provided by OSG. In addition, certain entities within INSW incurred similar costs in respect of corporate functions that provided services to non-INSW subsidiaries of OSG. An allocation of these corporate expenses, including legal costs related to certain litigation undertaken by OSG, has been reflected in the consolidated financial statements in general and administrative expenses, depreciation and amortization and reorganization items, net. Income earned directly by OSG is not subject to allocation because it is not directly related to the INSW business. Reorganization items, net for the year ended December 31, 2016, includes a credit for the recovery of costs allocated to INSW in prior years related to certain litigation undertaken by OSG that was settled by OSG in February 2016. Guarantees The FSO Joint Venture is a party to a number of contracts: (a) the FSO Joint Venture is the borrower pursuant to a loan agreement, as amended and restated, with OSG and Euronav, each as guarantors, certain other parties thereto and ING Bank N.V. as agent and security trustee (the ‘‘Loan Agreement’’); (b) the FSO Joint Venture is an obligor pursuant to a guarantee facility agreement, by and among, the FSO Joint Venture, those banks and financial institutions listed therein, Nordea Bank Finland PLC, as issuing bank, Nordea Bank Norge ASA as agent and ING Bank N.V. as Security Trustee (the ‘‘Guarantee Facility’’); and (c) the FSO Joint Venture is party to two service contracts with Maersk Oil Qatar AS (the ‘‘MOQ Service Contracts’’). In connection with the Distribution on November 30, 2016, INSW now guarantees the obligations of the FSO Joint Venture pursuant to the Loan Agreement and the Guarantee Facility (together, the ‘‘ING and Nordea Guarantees’’) and guarantees the obligations of the FSO Joint Venture pursuant to the MOQ Service Contracts (the ‘‘MOQ Guarantee’’), together with the ING and Nordea Guarantees, the ‘‘INSW FSO Guarantees’’). OSG continues to guarantee the obligations of the FSO Joint Venture pursuant to the Loan Agreement and the Guarantee Facility (together, the ‘‘OSG FSO Guarantees’’). As of December 31, 2016, the maximum potential amount of future principal payments (undiscounted) that OSG could be required to make relating to such equity method investees secured bank debt and interest rate swaps was $38,789 and the carrying amount of the liability related to this guarantee was $0 .  INSW entered into a guarantee arrangement in connection with the spin-off in favor of Qatar Liquefied Gas Company Limited (2) (‘‘LNG Charterer’’) and relating to certain LNG Tanker Time Charter Party Agreements with the LNG Charterer and each of Overseas LNG H1 Corporation, Overseas LNG H2 Corporation, Overseas LNG S1 Corporation and Overseas LNG S2 Corporation (such agreements, the ‘‘LNG Charter Party A greements’’, and such guarantee, the ‘‘LNG Performance Guarantee’’). OSG continues to provide a guarantee in favor of the LNG Charterer relating to the LNG Charter Party Agreements (such guarantees, the ‘ ‘OSG LNG Performance Guarantee ’’ and collectively, with the OSG FSO Guarantees the ‘‘Continuing OSG Guarantees’’). In connection with the Continuing OSG Guarantees, INSW will pay a $125 fee per year to OSG, which is subject to escalation after 2017 and will be terminated if OSG ceases to provide the OSG LNG Performance Guarantee. INSW will indemnify OSG for liabilities arising from the Continuing OSG Guarantees pursuant to the terms of the Separation and Distribution Agreement. In addition, INSW will pay QGTC an annual fee of $100 until such time that QGTC ceases to provide a guarantee in favor of the LNG charterer relating to performance under the LNG Charter Party Agreements.  Capital Contributions from OSG and Dividends Paid to OSG For the year ended December 31, 2016, the Company recorded capital contributions from OSG of $3,797 comprised of allocated reorganization items, net of $131 , non-cash expense relating to stock compensation benefits of $2,520 and certain allocated general and administrative costs of $1,146 . For the year ended December 31, 2015, the Company recorded capital contributions from OSG of $9,424 , comprised of allocated reorganizations items, net of $5,659 , non-cash expense relating to stock compensation benefits of $2,811 , certain allocated general and administrative expenses of $954. For additional information relating to stock compensation benefits see Note 14, “Capital Stock and Stock Compensation.”  During the years ended December 31, 2016 and 2015, INSW made dividend distributions to OSG totaling $202,000 (or $6.93 per share) and $200,000 (or $6.86 per share), respectively. Sales and purchases of vessels  Prior to commencement of the Chapter 11 cases INSW intended to purchase the Product Carrier Victory from OSG. The legal transfer of the Victory did not however occur prior to the Petition Date and thereafter required Bankruptcy Court approval. Even though the Victory was not legally transferred prior to December 31, 2012, the vessel’s cost structure and activities are similar to the operations of the other MRs in INSW’s fleet and, therefore, the Victory was included within the carve-out group on a combined basis at historical cost, net of accumulated depreciation, of $24,687 , effective November 14, 2012.  INSW purchased the Victory from OSG on June 30, 2014. As the Victory had been included in INSW’s financial statements on a combined basis prior to the purchase of the vessel, and is included on a consolidated basis subsequent to the purchase of the vessel, the purchase of the Victory is excluded from vessel deliveries in Note 6, “Vessels, Deferred Drydock and Other Property” for the year ended December 31, 2014.  At Emergence, Maremar Tanker LLC’s intercompany receivable balances were written off and treated as a non-cash capital distribution to OSG of $23,213 . Additionally, for the year ended December 31, 2014, INSW recorded a $124 charge to write off the remaining net assets of Maremar Tanker LLC.  Related Party Loans and Emergence from Bankruptcy  INSW was a co-borrower under an unsecured revolving credit facility and borrowings thereunder were effectuated through two related party loan agreements with OSG. At Emergence, INSW repaid the outstanding principal of $217,000 and unpaid accrued interest relating to its co-borrower obligation under the unsecured revolving credit facility. Also certain INSW entities were parties to two term loans, secured by vessels in INSW’s fleet, for which OSG was a guarantor. OSG made certain payments in connection with its Emergence, aggregating $477,835 , in its capacity as guarantor of the obligations of subsidiaries of INSW with respect to these two term loans, which for financial reporting purposes are deemed to be capital contributions. Supplemental cash flow information for the year ended December 31, 2014 associated with the aforementioned OSG guarantor obligation payments and deemed capital contributions were non-cash financing activities.  In accordance with the Equity Plan, on Emergence all amounts then due between OSG and INSW and its subsidiaries were deemed uncollectible and considered settled through deemed capital contributions by OSG aggregating $154,220 . Supplemental cash flow information for the year ended December 31, 2014 associated with such deemed capital contributions were non-cash financing activities. Concurrent with OSG’s Emergence and as part of the plan of reorganization, INSW made a $53,225 cash distribution to OSG. Post Emergence, OSG reimbursed INSW for certain compensation related expenses aggregating $6,306 , which for financial reporting purposes are deemed to be capital contributions.

CAPITAL STOCK AND STOCK COMPENS

CAPITAL STOCK AND STOCK COMPENSATION	12 Months Ended
	Dec. 31, 2016
Capital Stock and Stock Compensation [Abstract]
Capital Stock and Stock Compensation	NOTE 14 — CAPITAL STOCK AND STOCK COMPENSATION:  The Company accounts for stock compensation expense in accordance with the fair value based method required by ASC 718, Compensation – Stock Compensation . Such fair value based method requires share based payment transactions to be measured based on the fair value of the equity instruments issued.  In connection with the spin-off, effective November 18, 2016 INSW adopted, and OSG as its sole stockholder approved, incentive compensation plans (the “Incentive Plans” as further described below) in order to facilitate the grant of equity and cash incentives to directors, employees, including executive officers and consultants of the Company and certain of its affiliates and to enable the Company and certain of its affiliates to obtain and retain the services of these individuals, which is essential to our long-term success. INSW reserved 2,000,000 shares for issuance under its management incentive plan and 400,000 shares for issuance under its non-employee director incentive compensation plan.  OSG maintains or maintained various stock-based compensation arrangements (the “OSG Incentive Plans” and the “OSG 2004 Stock Incentive Plan” ), under which it provided awards to certain employees of INSW of restricted common stock, restricted stock units, performance restricted stock units and stock options to purchase shares of OSG. Because INSW provided employee services in consideration for the participation of INSW’s employees in these plans, a share-based compensation expense for the awards granted to INSW’s employees has been reflected in the consolidated statement of operations. Furthermore, the restricted stock, restricted stock unit and stock option grants also relate to directors or individuals that are considered to be employees of OSG. Compensation expense relating to such grants is a component of general and administrative expense on OSG’s consolidated statement of operations and as a result for periods prior to our spin-off from OSG was subject to the cost allocation procedures described in Note 1, “Description of the Business and Basis of Presentation,” and Note 13, “Related Parties.” In addition to the incentive compensation expense described below, Note 2, “Chapter 11 Filing and Emergence from Bankruptcy,” reorganization items, net reflects a charge of $1,374 for the year ended December 31, 2014 relating to the allocation of compensation cost relating to the cancellation of unvested awards under the OSG 2004 Stock Incentive Plan in conjunction with the Bankruptcy proceedings.  Each OSG restricted stock unit and performance restricted stock unit that was unvested and outstanding immediately prior to the Effective Time (see Note 1, “Description of the Business and Basis of Presentation”) and held by an INSW Group Employee (as defined by the Employee Matters Agreement) was converted as of the Effective Time into an INSW restricted stock unit or INSW performance restricted stock unit, respectively. Each OSG stock option to purchase shares of OSG that was outstanding immediately prior to the Effective Time and held by an INSW Group Employee was converted as of the Effective Time into an INSW stock option.  The OSG Incentive Plans contained anti-dilution provisions whereby in the event of any change in the capitalization of OSG, the number and type of securities underlying outstanding share based payment awards were to be adjusted, as appropriate, in order to prevent dilution or enlargement of rights. The impact of these provisions resulted in a modification of all outstanding share based payment awards held by INSW Group Employees upon the spinoff transaction. As the fair value of the INSW restricted stock unit or INSW performance restricted stock unit awards and the INSW stock option awards immediately after the spinoff transaction increased when compared to the fair value of the equivalent OSG awards held by INSW Group Employees immediately prior to the spinoff transactions, incremental compensation costs of approximately $427 will be recognized by INSW over the remaining vesting period of such awards as a result of the spinoff modifications.  Information regarding share-based compensation awards granted by INSW follows:  Director Compensation — Restricted Common Stock  INSW awarded a total of 32,067 restricted INSW common stock shares during the year ended December 31, 2016 to its non-employee directors. The weighted average fair value of INSW’s stock on the measurement date of such awards was $13.72 per share. Such restricted shares awards vest in full on the earlier of the next annual meeting of the stockholders or June 8, 2017, subject to each director continuing to provide services to INSW through such date. The restricted share awards granted may not be transferred, pledged, assigned or otherwise encumbered prior to vesting. Prior to the vesting date, a holder of restricted share awards has all the rights of a shareholder of INSW, including the right to vote such shares and the right to receive dividends paid with respect to such shares at the same time as common shareholders generally.  Management Compensation  Capitalized terms that follow are defined herein or in the Employee Matters Agreement.  (i) Restricted Stock Units  As of the Effective Time, INSW converted each time-based OSG restricted stock unit (“OSG RSU”) that was unvested and outstanding immediately prior to the Effective Time and that was held by an INSW Group Employee into an INSW restricted stock unit (each such award, an “INSW RSU”), with the number of restricted stock units subject to each such INSW RSU to be set at a number equal to the product of (A) the number of restricted stock units subject to the corresponding OSG RSU immediately prior to the Effective Time multiplied by (B) the quotient (“INSW Stock Ratio”) obtained by dividing the volume weighted average per share price of OSG Common Stock for the 20 Trading Days ending on the Distribution Date (the “OSG Pre-Distribution Stock Value”) by the volume weighted average per share price of INSW common stock for the 20 Trading Days following the Distribution Date (the “INSW Stock Value”), with any fractional restricted stock unit rounded down to the nearest whole restricted stock unit. Each INSW RSU will otherwise be subject to the same terms and conditions after the Effective Time as were applicable to such OSG RSU prior to the Effective Time (except as otherwise provided in the Employee Matters Agreement).  The aforementioned conversion resulted in the issuance of 76,585 time-based INSW RSUs to INSW Group Employees to replace non-vested time-based OSG RSUs previously awarded by OSG. The INSW grant date fair value of these awards was $15.00 per INSW RSU. Each INSW RSU represents a contingent right to receive one share of INSW common stock upon vesting. Each INSW RSU will vest in accordance with the terms and conditions of the corresponding OSG RSU award which were scheduled to vest in equal installments on each of the first three anniversaries of the corresponding OSG award date. Settlement of vested INSW RSUs may be in either shares of common stock or cash, as determined by the Human Resources and Compensation Committee in its discretion, and shall occur as soon as practicable after the vesting date.  INSW converted each OSG Performance Based Unit (“OSG PBU”) held by an INSW Group Employee that was unvested and outstanding immediately prior to the Effective Time into an INSW performance based unit (each such award, an “INSW PBU”), with the number of performance based units subject to each such INSW PBU to be set at a number equal to the product of (A) the number of performance based units subject to the corresponding OSG PBU immediately prior to the Effective Time multiplied by (B) the INSW Stock Ratio, with any fractional performance based unit rounded down to the nearest whole performance based unit. Each INSW PBU will otherwise be subject to the same terms and conditions after the Effective Time as were applicable to such OSG PBU prior to the Effective Time (except as otherwise provided in the Employee Matters Agreement). Applicable performance metrics are to be adjusted accordingly as determined by INSW’s Human Resources and Compensation Committee.  The aforementioned conversion resulted in the issuance of 33,709 INSW PBUs to INSW Group Employees to replace non-vested OSG PBUs awarded by OSG. Of this amount, 24,953 INSW PBUs represent a contingent right to receive INSW RSUs based upon the covered employees being continuously employed through December 31, 2018 and shall vest as follows: (i) one -third of the target RSUs shall vest on December 31, 2018, subject to INSW’s three-year earnings per share (“EPS”) performance in the three-year EPS performance period relative to a compounded annual growth rate (the “EPS Target”) set forth in the award agreements; (ii) one -third of the target RSUs shall vest on December 31, 2018, subject to INSW’s return on invested capital (“ROIC”) performance in the three-year ROIC performance period relative to a target rate (the “ROIC Target”) set forth in the award agreements; and (iii) one -third of the target RSUs will be subject to INSW’s three-year total shareholder return (“TSR”) performance relative to that of a performance peer group over a three-year TSR performance period (“TSR Target”). Vesting is subject in each case to INSW’s Human Resources and Compensation Committee’s (“Compensation Committee”) certification of achievement of the performance measures and targets no later than March 31, 2019. The EPS Target and ROIC Target are performance conditions which, as of December 31, 2016, INSW management believes, are not yet considered probable of being achieved. Accordingly, for financial reporting purposes, no compensation costs will be recognized for the portion of these awards relating to performance conditions until it becomes probable that the performance conditions will be achieved. The grant date fair value of the TSR based performance awards, which has a market condition, was determined to be $15.00 per INSW PBU. Each of the remaining 8,756 INSW PBUs represents a contingent right to receive INSW RSUs based upon certain performance related goals being met and INSW Group Employees being continuously employed through December 31, 2016. Such awards replaced the March 30, 2016 OSG award of the 2016 tranche of OSG PBU awards made on October 12, 2015 to INSW Group Employees and vested on December 31, 2016, subject to the Human Resources and Compensation Committee’s certification of achievement of the performance measures and targets no later than March 31, 2017.  Settlement of the vested INSW PBUs may be in either shares of common stock or cash, as determined by the Human Resources and Compensation Committee in its discretion, and shall occur as soon as practicable after the vesting date.  (ii) Stock Options  INSW converted each vested and unvested OSG Option outstanding immediately prior to the Effective Time and held by an INSW Group Employee into an INSW option to purchase INSW stock (each such option, an “INSW Spin Option”) subject to the same terms and conditions (including with respect to vesting and expirations) after the Effective Time as were applicable to the corresponding OSG stock option immediately prior to the Effective Time except as otherwise provided in the Employee Matters Agreement provided:  · the per-share exercise price of each such INSW Spin Option shall be equal to the product of (A) the per-share exercise price of the corresponding OSG Option immediately prior to the Effective Time multiplied by (B) the quotient (“INSW Price Ratio”) obtained by dividing the INSW Stock Value by the OSG Pre-Distribution Stock Value, rounded up to the nearest whole hundredth of a cent; and  · the number of shares of INSW Stock subject to each such INSW Spin Option shall be equal to the product of (A) the number of shares of OSG Common Stock subject to the corresponding OSG Option immediately prior to the Effective Time multiplied by (B) the INSW Stock Ratio, with any fractional share rounded down to the nearest whole share. As a result, 127,559 INSW Spin Options, with exercise prices ranging from $19.04 to $30.93 per share, were issued to INSW Group Employees to replace stock options previously awarded by OSG. Stock options may not be transferred, pledged, assigned or otherwise encumbered prior to vesting. The INSW Spin Options will vest in equal installments on each of the first three anniversaries of the corresponding OSG stock option award date. The INSW Spin Options will expire on the business day immediately preceding the ten th anniversary of the OSG award date. If a stock option grantee’s employment is terminated for cause (as defined in the applicable grant agreement), stock options (whether then vested or exercisable or not) will lapse and will not be exercisable. If a stock option grantee’s employment is terminated for reasons other than cause, the option recipient may exercise the vested portion of the stock option but only within such period of time ending on the earlier to occur of (i) the 90th day ending after the option recipient’s employment terminated and (ii) the expiration of the options, provided that if the Optionee’s employment terminates for death or disability the vested portion of the option may be exercised until the earlier of (i) the first anniversary of employment termination and (ii) the expiration date of the options. The fair value of the INSW Spin Options were estimated using the Black-Scholes option pricing model with inputs including the INSW Stock Value, the INSW exercise price and the following weighted average assumptions for the converted OSG Option originally granted in 2016, 2015 and 2014: risk free interest rates of 2.18% , 1.79% and 1.79% , respectively, dividend yields of 0.0% , expected stock price volatility factor of .40 , and expected lives at inception of five years, four years and four years, respectively. The weighted average grant-date fair value of INSW Spin Options relating to the corresponding OSG stock options originally granted in 2016, 2015 and 2014 were $4.55 , $2.26 and $1.86 , respectively .  Compensation expense is recognized over the vesting period applicable to each grant, using the straight-line method.  Direct and allocated compensation expense with respect to restricted common stock and restricted stock units outstanding for the years ended December 31, 2016, 2015 and 2014 was $2,157 , $2,380 and $497 , respectively. The allocated compensation expense has been recorded as a capital contribution from OSG as such amount will not be settled in cash.  Activity with respect to restricted common stock and restricted stock units under INSW compensation plans is summarized as follows:      Common Stock   Nonvested Shares Outstanding at December 31, 2015 -  INSW RSUs issued to replace OSG RSUs 110,294  Granted 32,067  Vested ( $19.04 per share) (25,103)  Forfeited -  Nonvested Shares Outstanding at December 31, 2016 117,258  Activity with respect to stock options under INSW compensation plans is summarized as follows:    Common Stock   Options Outstanding at December 31, 2015 -  INSW Spin Options issued to replace OSG options 127,559  Forfeited -  Exercised -  Options Outstanding at December 31, 2016 127,559  Options Exercisable at December 31, 2016 26,601  The weighted average remaining contractual life of the INSW outstanding stock options at December 31, 2016 was 8.76 years. The range of exercise prices of the INSW stock options outstanding at December 31, 2016 was between $19.04 and $30.93 per share. The weighted average exercise price of the INSW stock options outstanding at December 31, 2016 was $23.61 . No ne of the stock options which vested during 2016 were “in-the-money.” Direct and allocated compensation expense relating to stock options recorded by INSW for the years ended December 31, 2016, 2015 and 2014 was $684 , $431 and $56 , respectively. The allocated compensation expense has been recorded as a capital contribution from OSG as such amount will not be settled in cash.  As of December 31, 2016, there was $2,645 of unrecognized compensation cost related to INSW nonvested share-based compensation arrangements. That cost is expected to be recognized over a weighted average period of 1.46 years.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE LOSS	12 Months Ended
	Dec. 31, 2016
Accumulated Other Comprehensive Loss [Abstract]
Accumulated Other Comprehensive Loss	NOTE 15 —ACCUMULATED OTHER COMPREHENSIVE LOSS:  The components of accumulated other comprehensive loss, net of related taxes, in the consolidated balance sheets follow:      At December 31, 2016 2015  Unrealized losses on derivative instruments $ (40,317) $ (53,446)  Items not yet recognized as a component of net periodic benefit cost (pension plans) (11,950) (10,636)  Foreign currency translation adjustment - (42)  $ (52,267) $ (64,124)  The following tables present the changes in the balances of each component of accumulated other comprehensive loss, net of related taxes, for the three years ended December 31, 2016.     Unrealized losses on cash flow hedges Items not yet recognized as a component of net periodic benefit cost (pension plans) Foreign currency translation adjustment Total   Balance at December 31, 2015 $ (53,446) $ (10,636) $ (42) $ (64,124)  Current period change, excluding amounts reclassified from  accumulated other comprehensive loss (3,052) (2,364) 42 (5,374)  Amounts reclassified from accumulated other  comprehensive loss 16,181 1,050 - 17,231  Total change in accumulated other comprehensive loss 13,129 (1,314) 42 11,857  Balance at December 31, 2016 $ (40,317) $ (11,950) $ - $ (52,267)   Balance at December 31, 2014 $ (61,356) $ (12,988) $ (29) $ (74,373)  Current period change, excluding amounts reclassified from  accumulated other comprehensive loss (10,193) 1,870 (13) (8,336)  Amounts reclassified from accumulated other  comprehensive loss 18,103 482 - 18,585  Total change in accumulated other comprehensive loss 7,910 2,352 (13) 10,249  Balance at December 31, 2015 $ (53,446) $ (10,636) $ (42) $ (64,124)   Balance at December 31, 2013 $ (59,263) $ (8,246) $ (116) $ (67,625)  Current period change, excluding amounts reclassified from  accumulated other comprehensive loss (21,659) (5,069) 87 (26,641)  Amounts reclassified from accumulated other  comprehensive loss 19,566 327 - 19,893  Total change in accumulated other comprehensive loss (2,093) (4,742) 87 (6,748)  Balance at December 31, 2014 $ (61,356) $ (12,988) $ (29) $ (74,373) The following table presents information with respect to amounts reclassified out of accumulated other comprehensive loss for the three years ended December 31, 2016.    Years Ended December 31,  Accumulated Other Comprehensive Loss Component 2016 2015 2014 Statement of Operations Line Item   Unrealized losses on cash flow hedges:  Interest rate swaps entered into by the Company's Equity in income of  equity method joint venture investees $ (15,664) $ (18,101) $ (19,566) affiliated companies   Interest rate caps entered into by the Company's  subsidiaries (517) (2) - Interest expense   Items not yet recognized as a component of net  periodic benefit cost (pension plans):  Net periodic benefit costs associated with  pension and postretirement benefit plans for General and  shore-based employees (1,050) (482) (335) administrative expenses  (17,231) (18,585) (19,901) Total before tax   - - 8 Tax benefit (1)  $ (17,231) $ (18,585) $ (19,893) Total net of tax (1) The tax benefit relates to the net periodic benefit costs of the Company's pension plans.  The following amounts are included in accumulated other comprehensive loss at December 31, 2016, which have not yet been recognized in net periodic cost: unrecognized prior service costs of $1,403 ( $1,068 net of tax) and unrecognized actuarial losses of $12,173 ($ 10,882 net of tax). The prior service costs and actuarial loss es included in accumulated other comprehensive loss and expected to be recognized in net pe riodic cost during 2017 are losses of $64 (gross and net of tax) and $421 (gross and net of tax), respectively.  At December 31, 2016 , the Company expects that it will reclassify $12,499 (gr oss and net of tax) of net losses on derivative instruments from accumulated other comprehensive loss to earnings during the next twelve months due to the payment of variable rate interest associated with floating rate debt of INSW’s FSO and LNG equity method investees and the interest rate cap held by the Company.  See Note 7, “Equity Method Investments,” for additional information relating to derivatives held by the Company’s equity method investees and Note 10, “Fair Value of Financial Instruments, Derivatives and Fair Value,” for additional disclosures relating to derivative instruments.  The income tax expense/(benefit) allocated to each component of other comprehensive loss follows:    Tax expense / (benefit) on items not yet recognized as a component of net periodic benefit cost  For the year ended December 31, 2016  Current period change excluding amounts reclassified from accumulated other comprehensive loss $ -  Amounts reclassified from accumulated other comprehensive loss -  Total change in accumulated other comprehensive loss $ -   For the year ended December 31, 2015  Current period change excluding amounts reclassified from accumulated other comprehensive loss $ -  Amounts reclassified from accumulated other comprehensive loss -  Total change in accumulated other comprehensive loss $ -   For the year ended December 31, 2014  Current period change excluding amounts reclassified from accumulated other comprehensive loss $ -  Amounts reclassified from accumulated other comprehensive loss 8  Total change in accumulated other comprehensive loss $ 8 

LEASES

LEASES	12 Months Ended
	Dec. 31, 2016
Leases [Abstract]
Leases	NOTE 16 — LEASES:  1. Charters-in:  Between December 31, 2012 and April 2013, the Bankruptcy Court issued orders approving INSW debtor entities rejection of leases on 25 chartered-in International Flag vessels. INSW debtor entities entered into new lease agreements at lower rates on eight of the chartered-in vessels (seven MRs and one Aframax), which lease agreements were assumed as amended pursuant to orders of the Bankruptcy Court, at lower rates. One Suezmax and one MR were redelivered to owners in December 2012 and an additional fifteen vessels (11 MRs, two Panamax Product Carriers, one Suezmax and one Aframax), were redelivered during the four months ended April 30, 2013. The Company’s policy is to calculate estimates for lease termination costs related to the rejected charters using a market participant’s discount rate.  Effective August 5, 2014, the Company emerged from bankruptcy and during the month of August, allowed claims related to the rejected or amended vessel charters described above were settled. These settlements resulted in interest expense charges of $7,453 for post-petition contractual interest and reorganization item charges of $6,419 for post-petition interest required by the Equity Plan, for the year ended December 31, 2014. See Note 2, “Chapter 11 Filing and Emergence from Bankruptcy,” for additional information. As of December 31, 2016, the Company had commitments to charter-in seven vessels. All of the charter-ins are accounted for as operating leases, of which three are bareboat charters and four are time charters. Lease expense relating to charters-in is included in charter hire expenses in the consolidated statements of operations.  The future minimum commitments and related number of operating days under these operating leases are as follows:     Bareboat Charters-in:   At December 31, 2016 Amount Operating Days  2017 $ 7,016 1,063  2018 1,841 279  Net minimum lease payments $ 8,857 1,342 Time Charters-in:      At December 31, 2016 Amount Operating Days  2017 $ 15,440 1,488  Net minimum lease payments $ 15,440 1,488 The future minimum commitments for time charters-in exclude amounts with respect to vessels chartered-in where the duration of the charter was one year or less at inception but includes amounts with respect to workboats employed in Crude Tankers Lightering business. Time charters-in commitments have been reduced to reflect estimated days that the vessels will not be available for employment due to drydock because the Company does not pay time charter hire when time chartered-in vessels are not available for use. Certain of the charters in the above tables also provide the Company with renewal and purchase options. 2. Charters-out: The future minimum revenues, before reduction for brokerage commissions, expected to be received on noncancelable time charters and the related revenue days (revenue days represent calendar days, less days that vessels are not available for employment due to repairs, drydock or lay-up) are as follows:      At December 31, 2016 Amount Revenue Days  2017 $ 30,718 1,504  2018 913 166  Future minimum revenues $ 31,631 1,670 Future minimum revenues do not include (i) the Company’s share of time charters entered into by the pools in which it participates, (ii) the Company’s share of time charters entered into by the joint ventures, which the Company accounts for under the equity method. Revenues from a time charter are not generally received when a vessel is off-hire, including time required for normal periodic maintenance of the vessel. In arriving at the minimum future charter revenues, an estimated time off-hire to perform periodic maintenance on each vessel has been deducted, although there is no assurance that such estimate will be reflective of the actual off-hire in the future. 3. Office space: In connection with the spin-off, on November 17, 2016, OSG assigned to the Company its interest in the lease agreement the Company’s New York headquarters. The future minimum commitments under all lease obligations for office space are as follows:      At December 31, Amount  2017 $ 1,088  2018 998  2019 998  2020 998  2021 665  Net minimum lease payments $ 4,747 

PENSION AND OTHER POSTRETIREMEN

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS	12 Months Ended
	Dec. 31, 2016
Pension and Other Postretirement Benefit Plans [Abstract]
Pension and Other Postretirement Benefit Plans	NOTE 17 —PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS:  Pension plans  The Company has obligations outstanding under a defined benefit pension plan in the UK. The plan provides defined benefits based on years of service and final average salary. The plan was closed to new entrants and accrual from December 2007. The Company has provided a guarantee to the trustees of the OSG Ship Management (UK) Ltd. Retirement Benefits Plan (the “Scheme”) in the amount of the unfunded deficiency calculated on a solvency basis, if the principal employer fails to make the required periodic contributions to the Scheme.  Information with respect to the Scheme for which INSW uses a December 31 measurement date, is as follows:      Pension Benefits  At December 31, 2016 2015  Change in benefit obligation:  Benefit obligation at beginning of year $ 29,899 $ 34,138  Cost of benefits earned (service cost) - -  Interest cost on benefit obligation 932 1,164  Actuarial losses/(gains) 5,525 (2,387)  Benefits paid (603) (1,501)  Settlements (1,579) -  Foreign exchange gains (4,934) (1,515)  Benefit obligation at year end 29,240 29,899  Change in plan assets:  Fair value of plan assets at beginning of year 21,090 22,205  Actual return on plan assets 2,503 175  Employer contributions 7,605 1,161  Benefits paid (603) (1,501)  Settlements (1,775) -  Foreign exchange losses (3,354) (950)  Fair value of plan assets at year end 25,466 21,090  Unfunded status at December 31 $ (3,774) $ (8,809) The unfunded benefit obligation for the pension plan is included in other liabilities in the consolidated balance sheets. Information for the defined benefit pension plan with accumulated benefit obligations in excess of plan assets follows:      At December 31, 2016 2015  Projected benefit obligation $ 29,240 $ 29,899  Accumulated benefit obligation 29,240 29,899  Fair value of plan assets 25,466 21,090       Pension benefits  For the year ended December 31, 2016 2015 2014  Components of expense:  Cost of benefits earned $ - $ - $ 532  Interest cost on benefit obligation 886 1,164 1,333  Expected return on plan assets (951) (1,159) (1,573)  Amortization of prior-service costs 67 79 87  Recognized net actuarial loss 343 403 230  Recognized settlement loss 640 - -  Net periodic benefit cost $ 985 $ 487 $ 609 The weighted-average assumptions used to determine benefit obligations follow:      Pension benefits  At December 31, 2016 2015  Discount rate 2.60% 3.80%     The selection of a single discount rate for the defined benefit plan was derived from bond yield curves, which the Company believed as of such dates to be appropriate for the plan, reflecting the length of the liabilities and the yields obtainable on investment grade bonds. The assumption for a long-term rate of return on assets was based on a weighted average of rates of return on the investment sectors in which the assets are invested.  The weighted-average assumptions used to determine net periodic benefit costs follow:       Pension benefits  For the year ended December 31, 2016 2015 2014  Discount rate 3.80% 3.55% 4.50%  Expected (long-term) return on plan assets 5.62% 5.35% 7.29%  Rate of future compensation increases - - -  Expected benefit payments are as follows:       Pension benefits  2017 $ 1,015  2018 773  2019 785  2020 798  2021 1,025  Years 2022-2026 5,926  $ 10,322 The fair values of the Company’s pension plan assets at December 31, 2016, by asset category are as follows:     Description Fair Value Level 1 Level 2 (1)  Cash and cash equivalents $ 8,303 $ 8,303 $ -  Equity securities:  International companies 15,166 - 15,166  Government debt securities 1,997 - 1,997  Total $ 25,466 $ 8,303 $ 17,163   (1) Quoted prices for the equity and debt securities are not available from an active market source since such investments are index funds. Therefore, the mid-price, which is a price calculated based on the mid-point between the buying and the selling prices of the index funds assets, was used as such mid-prices are considered to be quoted prices for similar assets. Management has historically maintained a targeted allocation of between 86% and 90% of the Scheme assets in an equity fund index and between 10% and 14% in an over 15-year Gilt index fund.  The Company contributed $7,605 , $1,161 and $4,519 to the UK Scheme in 2016, 2015 and 2014, respectively. The Company expects that its contribution to the UK Scheme in 2017 will be approximately $719 . Defined Contribution Plans The Company has defined contribution plans covering all eligible shore-based employees. Contributions are limited to amounts allowable for income tax purposes and include employer matching contributions to the plans. All contributions to the plans are at the discretion of the Company. The contributions to the plan during the three years ended December 31, 2016 were not material.  The expenses directly attributable to INSW’s employees for these defined contribution plans for each of the years ended December 31, 2016, 2015 and 2014 were not material.

SEVERANCE COSTS

SEVERANCE COSTS	12 Months Ended
	Dec. 31, 2016
Severance Costs [Abstract]
Severance Costs	NOTE 18 —SEVERANCE COSTS:  Severance Severance related costs are recognized over the period commencing on the date on which the affected employees are notified and ending on the date when required services are completed. Costs Associated with Exit or Disposal Activities On January 13, 2014, OSG announced that certain of its subsidiaries, all of which are subsidiaries of INSW, that own or charter-in 33 International Flag vessels (which was subsequently increased to 46 vessels) intended to outsource certain management services, including, but not limited to, the technical management, certain aspects of commercial management and crew management to V. Ships UK Limited (“V.Ships”). Charges relating to employee transition and termination benefits and similar transition and termination costs (“Outsourcing RIF”) and set-up, wind-down and transitions costs (“Transition Costs”) are included separately in the consolidated statement of operations. Outsourcing RIF severance costs of $16,666 incurred for the year ended December 31, 2014 included $3,428 and $7,651 relating to the International Crude Tankers and International Product Carriers business segments, respectively, with the balance relating to corporate offices. INSW did not incur any additional Outsourcing RIF costs during the 2016 or 2015. Transition Costs of $39 and $3,417 were incurred for the years ended December 31, 2015 and 2014. The Transition costs for 2014 included $1,672 and $1,260 relating to the International Crude Tankers and International Product Carriers business segments, respectively, with the balance relating to corporate offices.  In conjunction with the aforementioned, on January 7, 2014, the then current Board of Directors of OSG (the “Predecessor Board”) and the Compensation Committee of the Predecessor Board approved a transitional incentive program for certain non-executive employees (the “Transition NEIP”), which was subsequently approved by the Bankruptcy Court on February 3, 2014. In order to achieve the restructuring described above, OSG required the commitment of the employees whose responsibilities would ultimately be outsourced or rendered unnecessary by virtue of the outsourcing (the “Transitional Employees”). The Transition NEIP, a component of the employee transition and termination benefits and similar transition and termination costs described above, was a broad based plan intended to offer compensation incentives to substantially all of the non-executive Transitional Employees (the “Eligible Employees”) upon the achievement of specific objectives (“Objectives”) related to the operations and restructuring of INSW’s operations. For Eligible Employees, the annualized target awards ranged from 25% to 75% of base salary. The total cost of the incentive payments under the Transition NEIP for INSW employees for the year ended December 31, 2014 was approximately $3,228 .  Refer to Note 13, “Related Parties,” for additional information relating to severance costs allocated from OSG.

2015 AND 2014 QUARTERLY RESULTS

2015 AND 2014 QUARTERLY RESULTS OF OPERATIONS	12 Months Ended
	Dec. 31, 2016
2016 AND 2015 QUARTERLY RESULTS OF OPERATIONS [Abstract]
2015 AND 2014 QUARTERLY RESULTS OF OPERATIONS	NOTE 19 — 2016 AND 2015 QUARTERLY RESULTS OF OPERATIONS (UNAUDITED):       Selected Financial Data for the Quarter Ended March 31, June 30, Sept. 30, Dec. 31,  2016  Shipping revenues $ 128,676 $ 103,062 $ 80,771 $ 85,810  Gain/(loss) on disposal of vessels and other property, including impairments 171 - (49,640) (29,734)  Income/(loss) from vessel operations 53,129 29,079 (47,758) (28,509)  Interest expense (10,742) (9,690) (9,519) (9,525)  Reorganization items, net 4,471 (520) (3,849) (233)  Income tax benefit/(provision) (4) (173) 20 (283)  Net income/(loss) (1) 59,890 30,506 (50,862) (57,757)   Basic and Diluted net income/(loss) per share $ 2.05 $ 1.05 $ (1.74) $ (1.98) (1) As discussed in Note 7, "Equity Method Investments," the Company recorded impairment charges of $30,475 in the fourth quarter related to its investment in the FSO Joint Venture.     Selected Financial Data for the Quarter Ended March 31, June 30, Sept. 30, Dec. 31,  2015  Shipping revenues $ 117,450 $ 124,093 $ 131,121 $ 124,970  Gain/(loss) on disposal of vessels and other property, including impairments 1,166 - 3,238 55  Income/(loss) from vessel operations 36,045 47,676 52,982 39,611  Interest expense (10,420) (10,566) (11,050) (10,934)  Reorganization items, net (2,368) (1,187) (953) (1,151)  Income tax benefit/(provision) 236 (95) (27) (254)  Net income/(loss) 35,941 47,690 51,933 37,606   Basic and Diluted net income/(loss) per share $ 1.23 $ 1.64 $ 1.78 $ 1.29

CONTINGENCIES

CONTINGENCIES	12 Months Ended
	Dec. 31, 2016
Contingencies [Abstract]
Contingencies	NOTE 20 — CONTINGENCIES:  INSW’s policy for recording legal costs related to contingencies is to expense such legal costs as incurred.  Multi-Employer Plans The Merchant Navy Officers Pension Fund (“MNOPF”) is a multi-employer defined benefit pension plan covering British crew members that served as officers on board INSW’s vessels (as well as vessels of other owners). The trustees of the plan have indicated that, under the terms of the High Court ruling in 2005, which established the liability of past employers to fund the deficit on the Post 1978 section of MNOPF, calls for further contributions may be required if additional actuarial deficits arise or if other employers liable for contributions are not able to pay their share in the future. As the amount of any such assessment cannot currently be reasonably estimated, no reserves have been recorded for this contingency in INSW’s consolidated financial statements as of December 31 , 2016. The next deficit valuation is due March 31, 2018. The Merchant Navy Ratings Pension Fund (“MNRPF”) is a multi-employer defined benefit pension plan covering British crew members that served as ratings (seamen) on board INSW’s vessels (as well as vessels of other owners) more than 20 years ago. During 2014 the trustees of the MNRPF sought court approval for a new deficit reduction regime for participating employers. Participating employers include current employers, historic employers that have made voluntary contributions, and historic employers such as OSG that have made no deficit contributions. The trustees received court approval of the new deficit reduction regime in February 2015 and INSW received an assessment of $1,487 which was recorded in June 2015, of which £700 ( $1,074 ) was paid in October 2015 and the balance was paid on October 25, 2016. Calls for further contributions may be required if additional actuarial deficits arise or if other employers liable for contributions are unable to pay their share in the future. As the amount of any such assessment cannot be reasonably estimated, no reserves for this contingency have been recorded in INSW’s consolidated financial statements as of December 31 , 2016. The next deficit valuation is due March 31, 201 7 . Legal Proceedings Arising in the Ordinary Course of Business The Company is a party, as plaintiff or defendant, to various suits in the ordinary course of business for monetary relief arising principally from personal injuries, wrongful death, collision or other casualty and to claims arising under charter parties and other contract disputes . A substantial majority of such personal injury, wrongful death, collision or other casualty claims against the Company are covered by insurance (subject to deductibles not material in amount). Each of the claims involves an amount which, in the opinion of management, should not be material to the Company’s financial position, results of operations and cash flows. 

SUMMARY OF SIGNIFICANT ACCOUN29

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2016
Significant Accounting Policies [Abstract]
Cash and cash equivalents	1. Cash and cash equivalents — Interest-bearing deposits that are highly liquid investments and have a maturity of three months or less when purchased are included in cash and cash equivalents. Legally restricted cash as of December 31, 2015 of $8,989 , relating to the INSW Facilities, is included in the non-current assets section of the consolidated balance sheets. The INSW Facilities stipulate that if annual aggregate cash proceeds of INSW asset sales exceed $5,000 , cash proceeds from each such sale were required to be reinvested in vessels within twelve months of such sale or used to prepay the principal balance outstanding of the INSW Term Loan. Activity relating to restricted cash is reflected in investing activities in the consolidated statements of cash flow. See Note 9, “Debt,” for a further discussion of the INSW Term Loan.
Concentration of Credit Risk	2. Concentration of Credit Risk — Financial instruments that potentially subject the Company to concentrations of credit risk are voyage receivables due from charterers and pools in which the Company participates. With respect to voyage receivables, the Company limits its credit risk by performing ongoing credit evaluations. Voyage receivables reflected in the consolidated balance sheets as of December 31, 2016 and 2015 are net of an allowance for doubtful accounts of $70 and $415 , respectively. The provisions for doubtful accounts for the years ended December 31, 2016, 2015 and 2014 were not material. During the three years ended December 31, 2016, the Company did not have any individual customers who accounted for 10% or more of its revenues apart from the pools in which it participates. The pools in which the Company participates accounted for 90% and 82% of consolidated voyage receivables at December 31, 2016 and 2015.
Inventories	Inventories —Inventories, which consists principally of fuel, are stated at cost determined on a first-in, first-out basis.
Vessels, vessel lives, deferred drydocking expenditures and other property	4. Vessels, vessel lives, deferred drydocking expenditures and other property —Vessels are recorded at cost and are depreciated to their estimated salvage value on the straight-line basis over the lives of the vessels, which are generally 25 years. Each vessel’s salvage value is equal to the product of its lightweight tonnage and an estimated scrap rate of $300 per ton. Other property, including leasehold improvements, are recorded at cost and amortized on a straight-line basis over the shorter of the terms of the leases or the estimated useful lives of the assets, which range from three to seven years.  Interest costs are capitalized to vessels during the period that vessels are under construction, however, no interest was capitalized during 2016, 2015 or 2014. Expenditures incurred during a drydocking are deferred and amortized on the straight-line basis over the period until the next scheduled drydocking, generally two and a half to five years. The Company only includes in deferred drydocking costs those direct costs that are incurred as part of the drydocking to meet regulatory requirements, or are expenditures that add economic life to the vessel, increase the vessel’s earnings capacity or improve the vessel’s efficiency. Direct costs include shipyard costs as well as the costs of placing the vessel in the shipyard. Expenditures for normal maintenance and repairs, whether incurred as part of the drydocking or not, are expensed as incurred.  The carrying value of each of the Company’s vessels represents its original cost at the time it was delivered or purchased less depreciation calculated using estimated useful lives from the date such vessel was originally delivered from the shipyard. A vessel’s carrying value is reduced to its new cost basis (i.e., its current fair value) if a vessel impairment charge is recorded.
Impairment of long-lived assets	Impairment of long-lived assets —The carrying amounts of long-lived assets held and used by the Company are reviewed for potential impairment whenever events or changes in circumstances indicate that the carrying amount of a particular asset may not be fully recoverable. In such instances, an impairment charge would be recognized if the estimate of the undiscounted future cash flows expected to result from the use of the asset and its eventual disposition is less than the asset’s carrying amount. This assessment is made at the individual vessel level since separately identifiable cash flow information for each vessel is available. The impairment charge, if any, would be measured as the amount by which the carrying amount of a vessel exceeded its fair value. If using an income approach in determining the fair value of a vessel, the Company will consider the discounted cash flows resulting from highest and best use of the vessel asset from a market-participant’s perspective. Alternatively, if using a market approach, the Company will obtain third party appraisals of the estimated fair value of the vessel. A long lived asset impairment charge results in a new cost basis being established for the relevant long lived asset. See Note 6, “Vessels,” for further discussion on the impairment tests performed on certain of our vessels during the three years ended December 31, 2016.
Deferred finance charges	6. Deferred finance charges —Finance charges incurred in the arrangement and /or amendments resulting in the modification of debt are deferred and amortized to interest expense on either an effective interest method or straight-line basis over the life of the related debt. Unamortized deferred finance charges of $ 1,691 and $1,741 relating to the INSW Revolver Facility are included in other assets in the consolidated balance sheets as of December 31, 2016 and 2015, respectively. Unamortized deferred finance charges of $19,827 and $22,866 relating to the INSW Term Loan (as defined in Note 9, “Debt”) are included in long-term debt (reflecting the adoption of ASU No. 2015-03) on the consolidated balance sheets as of December 31, 2016 and 2015.  Interest expense relating to the amortization of deferred financing costs amounted to $6,449 in 2016 , $ 5,625 in 2015 and $1,928 in 2014 .
Revenue and expense recognition	7. Revenue and expense recognition —Revenues from time charters and bareboat charters are accounted for as operating leases and are thus recognized ratably over the rental periods of such charters, as service is performed. Voyage revenues and expenses are recognized ratably over the estimated length of each voyage, calculated on a discharge-to-discharge basis and, therefore, are allocated between reporting periods based on the relative transit time in each period. The impact of recognizing voyage expenses ratably over the length of each voyage is not materially different on a quarterly and annual basis from a method of recognizing such costs as incurred. The Company does not begin recognizing voyage revenue until a charter has been agreed to by both the Company and the customer, even if the vessel has discharged its cargo and is sailing to the anticipated load port on its next voyage. Under voyage charters, expenses such as fuel, port charges, canal tolls, cargo handling operations and brokerage commissions are paid by the Company whereas, under time and bareboat charters, such voyage costs are paid by the Company’s customers. For the Company’s vessels operating in pools, revenues and voyage expenses are pooled and allocated to each pool’s participants on a time charter equivalent (“TCE”) basis in accordance with an agreed-upon formula. Such TCE revenues are reported as pool revenues in the accompanying consolidated statement of operations. For the pools in which the Company participates, management monitors, among other things, the relative proportion of the Company’s vessels operating in each of the pools to the total number of vessels in each of the respective pools, and assesses whether or not the Company’s participation interest in each of the pools is sufficiently significant so as to determine that the Company has effective control of the pool. Management determined that as of June 30, 2013, it had effective control of one of the pools in which the Company participated. Such pool was not a legal entity but operated under a contractual agreement. Therefore, effective July 1, 2013 and through to June 30, 2014, when the Company exited this pool, the Company’s allocated TCE revenues for such pool were reported on a gross basis as voyage charter revenues and voyage expenses in the consolidated statement of operations. The impact of this method of presenting earnings for this pool for the year ended December 31, 2014 was an increase in both voyage charter revenues and voyage expenses of $40,454 .
Derivatives	8. Derivatives —ASC 815, Derivatives and Hedging , requires the Company to recognize all derivatives on the balance sheet at fair value. Derivatives that are not effective hedges must be adjusted to fair value through earnings. If the derivative is an effective hedge, depending on the nature of the hedge, a change in the fair value of the derivative is either offset against the change in fair value of the hedged item (fair value hedge), or recognized in other comprehensive income/(loss) and reclassified into earnings in the same period or periods during which the hedge transaction affects earnings (cash flow hedge). The ineffective portion (that is, the change in fair value of the derivative that does not offset the change in fair value of the hedged item) of an effective hedge and the full amount of the change in fair value of derivative instruments that do not qualify for hedge accounting are immediately recognized in earnings. The Company formally documents all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivatives that are designated as cash flow hedges to forecasted transactions. The Company also formally assesses (both at the hedge's inception and on an ongoing basis) whether the derivatives that are used in hedging transactions have been highly effective in offsetting changes in the cash flows of hedged items and whether those derivatives may be expected to remain highly effective in future periods. When it is determined that a derivative is not (or has ceased to be) highly effective as a hedge, the Company discontinues hedge accounting prospectively, as discussed below. The Company discontinues hedge accounting prospectively when (1) it determines that the derivative is no longer effective in offsetting changes in the cash flows of a hedged item such as forecasted transactions; (2) the derivative expires or is sold, terminated, or exercised; (3) it is no longer probable that the forecasted transaction will occur; or (4) management determines that designating the derivative as a hedging instrument is no longer appropriate or desired. When the Company discontinues hedge accounting because it is no longer probable that the forecasted transaction will occur in the originally expected period, the gain or loss on the derivative remains in accumulated other comprehensive loss and is reclassified into earnings when the forecasted transaction affects earnings. However, if it is probable that a forecasted transaction will not occur by the end of the originally specified time period or within an additional two-month period of time thereafter, the gains and losses that were accumulated in other comprehensive loss will be recognized immediately in earnings. In all situations in which hedge accounting is discontinued and the derivative remains outstanding, the Company will carry the derivative at its fair value on the balance sheet, recognizing changes in the fair value in current-period earnings, unless it is designated in a new hedging relationship. During the three years ended December 31, 2016, no ineffectiveness gains or losses were recorded in earnings relative to interest rate caps entered into by the Company or its subsidiaries that qualified for hedge accounting. Any gain or loss realized upon the early termination of an interest rate cap is recognized as an adjustment of interest expense over the shorter of the remaining term of the cap or the hedged debt. See Note 10, “Fair Value of Financial Instruments, Derivatives and Fair Value Disclosures,” for additional disclosures on the Company’s interest rate caps and other financial instruments.
Income taxes	9. Income taxes — Substantially all of the companies included in the Company’s consolidated financial statements were excluded from the OSG consolidated group for U.S. income tax purposes for the eleven month period ended November 30, 2016 and the years ended December 31, 2015 and 2014 . T he Company’s financial statements have been prepared on the basis that OSG was responsible for all U.S. taxes for periods prior to December 1, 2016. Prior to December 1, 2016, the Company had not operated as an independent stand-alone entity. However, for the purposes of these consolidated financial statements the Company has calculated income taxes as if it had filed relevant income tax returns on a stand-alone basis. T he Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. Net deferred tax assets are recorded to the extent the Company believes these assets will more likely than not be realized. In making such a determination, all available positive and negative evidence is considered, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. In the event the Company were to determine that it would be able to realize its deferred income tax assets in the future in excess of their net recorded amount, an adjustment would be made to the deferred tax asset valuation allowance, which would reduce the provision for income taxes in the period such determination is made. Uncertain tax positions are recorded in accordance with ASC 740, Income Taxes, on the basis of a two-step process whereby (1) the Company first determines whether it is more likely than not that the tax positions will be sustained based on the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the largest amount of tax benefit that is greater than 50% likely to be realized upon ultimate settlement with the related tax authority.
Valuation of equity method investments	Valuation of equity method investments — When events and circumstances warrant, investments accounted for under the equity method of accounting are evaluated for impairment. An impairment charge is recorded whenever a decline in fair value of an investment below its carrying amount is determined to be other-than-temporary. Impairment charges related to equity method investments are record ed in equity in i ncome of a ffiliated c ompanies in the accompanying consolidated statements of operations . See Note 7, “Equity Method Investments,” for further discussion of the impairment tests performed on certain of our equity method investments during the year ended December 31, 2016.
Use of estimates	Use of estimates —The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts of assets, liabilities, equity, revenues and expenses reported in the financial statements and accompanying notes. The most significant estimates relate to the depreciation of vessels and other property, amortization of drydocking costs, estimates used in assessing the recoverability of goodwill, equity method investments, intangible and other long-lived assets, liabilities incurred relating to pension benefits, and income taxes. Actual results could differ from those estimates.
Recently adopted / issued accounting standards	12. Recently Adopted Accounting Standards — In August 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (ASC 205), which explicitly requires management to assess an entity’s ability to continue as a going concern and disclose going concern uncertainties in connection with each annual and interim period. The new standard requires management to assess if there is substantial doubt about an entity’s ability to continue to meet its obligations within one year after the reporting date based upon management’s consideration of relevant conditions that are known (and reasonably knowable) at the issuance date. The new standard defines substantial doubt and provides example indicators. Disclosures will be required if conditions give rise to substantial doubt. However, management will need to assess if its plans will alleviate substantial doubt to determine the specific disclosures. The new standard is effective for all entities in the first annual period ending after December 15, 2016. The adoption of this accounting standard did not have any impact on the Company’s consolidated financial statements.  13. Recently Issued Accounting Standards — In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASC 715), which requires that an employer classify and report the service cost component in the same line item or items in the statement of operations as other compensation costs arising from services rendered by the pertinent employees during the period and disclose by line item in the statement of operations, the amount of net benefit cost that is included in the statement of operations. The other components of net benefit cost would be presented in the statement operations separately from the service cost component and outside the subtotal of income from operations. The standard will be effective for interim and annual periods beginning after December 31, 2017 and early adoption is permitted. The guidance requires application using a retrospective transition method.  In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (ASC 230): Restricted Cash , which requires that amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The standard will be effective for annual periods beginning after December 31, 2017 and interim periods within that reporting period. Management does not expect the adoption of this accounting standard to have a material impact on the Company’s consolidated statements of cash flows.  In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (ASC 230), which amends the guidance in ASC 230 on the classification of certain cash receipts and payments in the statement of cash flows. The primary purpose of the ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic with respect to (1) debt prepayment or debt extinguishment costs; (2) settlement of zero-coupon debt; (3) contingent consideration payments made after a business combination; (4) proceeds from the settlement of insurance claims; (5) proceeds from the settlement of corporate-owned life insurance policies; (6) distributions received from equity method investees; (7) beneficial interests in securitization transactions; and (8) separately identifiable cash flows and application of the predominance principle. The standard will be effective for interim and annual periods beginning after December 31, 2017 and early adoption is permitted. The guidance requires application using a retrospective transition method. Management is currently reviewing the impact of the adoption of this accounting standard on the Company’s consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (ASC 718), which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, forfeitures, classification of awards as either equity or liabilities, and classification in the statement of cash flows. The standard will be effective for annual periods beginning after December 31, 2016 and interim periods within that reporting period. Management does not expect the adoption of this accounting standard to have any impact on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (ASC 842), which requires lessees to recognize most leases on the balance sheet. This is expected to increase both reported assets and liabilities. For public companies, the standard will be effective for the first interim reporting period within annual periods beginning after December 15, 2018, although early adoption is permitted. Lessees and lessors will be required to apply the new standard at the beginning of the earliest period presented in the financial statements in which they first apply the new guidance, using a modified retrospective transition method. The requirements of this standard include a significant increase in required disclosures. Management is analyzing the impact of the adoption of this guidance on the Company’s consolidated financial statements, including assessing changes that might be necessary to information technology systems, processes and internal controls to capture new data and address changes in financial reporting. Management expects that the Company could recognize increases in reported amounts for property, plant and equipment and related lease liabilities upon adoption of the new standard.  In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASC 606), a standard that will supersede virtually all of the existing revenue recognition guidance in U.S. GAAP. The standard establishes a five-step model that will apply to revenue earned from a contract with a customer. The standard’s requirements will also apply to the sale of some non-financial assets that are not part of an entity’s ordinary activities (e.g., sales of property or plant and equipment). Extensive disclosures will be required, including disaggregation of total revenue, information about performance obligations, changes in contract asset and liability account balances between periods and key judgments and estimates. The FASB has recently issued several amendments to the standard, including clarification of the accounting for licenses of intellectual property and identifying performance obligations. The guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the cumulative catch-up transition method). The new standard will be effective for us beginning January 1, 2018. We currently anticipate adopting the standard using the cumulative catch-up transition method , however, as our evaluation progresses we may ultimately elect the alternative approach. We are undertaking a comprehensive approach to assess the impact of the guidance on our business by reviewing our current accounting policies and practices to identify any potential differences that may result from applying the new requirements to our consolidated financial statements. We are also consulting with other shipping companies on business assumptions, processes, systems and controls to determine revenue recognition and disclosure under the new standard. We continue to make progress on our review of the standard. Our initial assessment may change as we continue to refine these assumptions.

CHAPTER 11 FILING AND EMERGEN30

CHAPTER 11 FILING AND EMERGENCE FROM BANKRUPTCY (Tables)	12 Months Ended
	Dec. 31, 2016
Chapter 11 Filing Going Concern and Other Related Matters [Abstract]
Schedule of Reorganization Items Net	Reorganization items, net represent amounts incurred subsequent to the Petition Date as a direct result of the filing of the Chapter 11 cases and are comprised of the following:     For the year ended December 31, 2016 2015 2014  Allocated trustee fees $ 74 $ 147 $ 1,929  Allocated professional fees (3,220) 5,422 81,381  Provision for and expenses incurred on rejected executory contracts  including post-petition interest - - 6,419  Provision for post-petition interest on debt facilities - - 10,095  2004 Stock Incentive Plan - - 1,374  Other claim adjustments 3,277 90 3,330  $ 131 $ 5,659 $ 104,528 

EARNINGS PER COMMON SHARE (Tabl

EARNINGS PER COMMON SHARE (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings per Common Share [Abstract]
Schedule of Weighted Average Number of Shares	The table below shows the effect of the stock split on the calculation of per share amounts previously reported:    Year ended  December 31, 2015 December 31, 2014  Increase in weighted average number of shares outstanding used to calculate basic and diluted net income/(loss) per share amounts 29,157,285 29,157,285   Change in net income/(loss) per share - basic and diluted $ (1,694,250.98) $ 1,165,234.16 
Components of Calculation of Earnings Per Share	The components of the calculation of basic and diluted earnings per share are as follows:    For the year ended December 31, 2016 2015 2014  Net (loss)/income $ (18,223) $ 173,170 $ (119,099)   Weighted average common shares outstanding:  Common stock - basic 29,157,992 - - 29,157,387 - - 29,157,387  Common stock - diluted 29,157,992 - - 29,157,387 - - 29,157,387  Reconciliations of the numerator of the basic and diluted earnings per share computations are as follows:     For the year ended December 31, 2016 2015 2014  Net (loss)/income allocated to:  Common Stockholders $ (18,223) $ 173,170 $ (119,099)  Participating securities - - -  $ (18,223) $ 173,170 $ (119,099) 

BUSINESS AND SEGMENT REPORTING

BUSINESS AND SEGMENT REPORTING (Tables)	12 Months Ended
	Dec. 31, 2016
Business and Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Information about the Company’s reportable segments as of and for each of the years in the three-year period ended December 31, 2016 follows:       Crude Product  Tankers Carriers Other Totals  2016  Shipping revenues $ 271,764 $ 126,555 $ - $ 398,319  Time charter equivalent revenues 258,171 126,314 560 385,045  Depreciation and amortization 52,395 26,696 794 79,885  Gain/(loss) on disposal of vessels and other property, including impairments (7,585) (71,456) (162) (79,203)  Adjusted income from vessel operations 111,768 13,327 710 125,805  Equity in income of affiliated companies 5,584 - 11,265 16,849  Investments in and advances to affiliated companies at December 31, 2016 266,470 15,296 76,915 358,681  Adjusted total assets at December 31, 2016 1,066,184 422,579 76,915 1,565,678  Expenditures for vessels and vessel improvements 691 1,297 - 1,988  Payments for drydockings 7,636 1,622 - 9,258  2015  Shipping revenues 324,703 172,931 - 497,634  Time charter equivalent revenues 304,182 171,608 - 475,790  Depreciation and amortization 51,347 28,763 1,543 81,653  Gain/(loss) on disposal of vessels and other property (31) 3,231 1,259 4,459  Adjusted income/(loss) from vessel operations 157,840 56,746 (1,176) 213,410  Equity in income of affiliated companies 34,371 - 11,188 45,559  Investments in and advances to affiliated companies at December 31, 2015 276,839 13,793 54,259 344,891  Adjusted total assets at December 31, 2015 1,148,361 505,353 43,340 1,697,054  Expenditures for vessels and vessel improvements 91 873 - 964  Payments for drydockings 13,842 6,886 - 20,728  2014  Shipping revenues 363,331 153,665 22 517,018  Time charter equivalent revenues 228,296 118,669 22 346,987  Depreciation and amortization 56,280 26,893 1,758 84,931  Gain/(loss) on disposal of vessels and other property 9,978 (44) 21 9,955  Adjusted income/(loss) from vessel operations 65,462 3,386 (1,519) 67,329  Equity in income of affiliated companies 30,837 - 7,035 37,872  Investments in and advances to affiliated companies at December 31, 2014 277,815 11,334 42,286 331,435  Adjusted total assets at December 31, 2014 1,191,490 551,569 25,368 1,768,427  Expenditures for vessels and vessel improvements 1,437 20,017 - 21,454  Payments for drydockings 5,286 6,792 - 12,078 
Reconciliation of Revenue from Segments to Consolidated	Reconciliations of time charter equivalent revenues of the segments to shipping revenues as reported in the consolidated statements of operations follow:     For the year ended December 31, 2016 2015 2014  Time charter equivalent revenues $ 385,045 $ 475,790 $ 346,987  Add: Voyage expenses 13,274 21,844 170,031  Shipping revenues $ 398,319 $ 497,634 $ 517,018  
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	Reconciliations of adjusted income from vessel operations of the segments to income/(loss) before income taxes, as reported in the consolidated statements of operations follow:     For the year ended December 31, 2016 2015 2014  Total adjusted income from vessel operations of all segments $ 125,805 $ 213,410 $ 67,329  General and administrative expenses (31,618) (41,516) (52,597)  Severance costs - - (16,666)  Separation and transition costs (9,043) - -  Technical management transition costs - (39) (3,417)  Gain/(loss) on disposal of vessels and other property, including impairments (79,203) 4,459 9,955  Consolidated income from vessel operations 5,941 176,314 4,604  Equity in income of affiliated companies 16,849 45,559 37,872  Other income/(expense) (966) 66 (45)  Interest expense (39,476) (42,970) (56,258)  Reorganization items, net (131) (5,659) (104,528)  Income/(loss) before income taxes $ (17,783) $ 173,310 $ (118,355) 
Reconciliation of Assets from Segment to Consolidated	Reconciliations of total assets of the segments to amounts included in the consolidated balance sheets follow:    At December 31, 2016 2015  Total adjusted assets of all segments $ 1,565,678 $ 1,697,054  Corporate unrestricted cash and cash equivalents 92,001 308,858  Corporate restricted cash - 8,989  Other unallocated amounts 4,842 15,049  Consolidated total assets $ 1,662,521 $ 2,029,950 
Long Lived Assets Deployment by Segment	Certain additional information about the Company’s operations for each of the years in the three year period ended December 31, 2016 follows:     Crude Product  Consolidated Tankers Carriers Other  2016  Total vessels, deferred drydock and other property at December 31, 2016 $ 1,130,607 $ 753,028 $ 377,095 $ 484  2015  Total vessels, deferred drydock and other property at December 31, 2015 $ 1,277,486 $ 804,514 $ 472,675 $ 297  2014  Total vessels, deferred drydock and other property at December 31, 2014 $ 1,345,863 $ 837,950 $ 499,822 $ 8,091 

VESSELS, DEFERRED DRYDOCK AND33

VESSELS, DEFERRED DRYDOCK AND OTHER PROPERTY (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Schedule of Property	Vessels and other property consist of the following:     As of 2016 2015 Vessels, at cost $ 1,478,940 $ 1,642,891 Accumulated depreciation (381,449) (404,957) Vessels, net 1,097,491 1,237,934  Other property, at cost 8,680 8,126 Accumulated depreciation and amortization (6,121) (5,649) Other property, net 2,559 2,477  Total Vessels and other property $ 1,100,050 $ 1,240,411  Drydocking activity for the three years ended December 31, 2016 is summarized as follows:    For the year ended December 31, 2016 2015 2014 Balance at January 1 $ 37,075 $ 29,325 $ 36,053 Additions 8,822 22,981 12,078 Sub-total 45,897 52,306 48,131 Drydock amortization (15,340) (15,231) (16,441) Amounts recognized upon sale/redelivery of vessels and non-cash adjustments - - (2,365) Balance at December 31 $ 30,557 $ 37,075 $ 29,325 
Schedule of Property Plant and Equipment by Segment	All except one of the Company’s vessels are pledged as collateral under the INSW Facilities (see Note 9, “Debt”). The aggregate carrying value of the 41 vessels pledged as collateral under the INSW Facilities at December 31, 2016 was $1,092,072 . A breakdown of the carrying value of the Company’s vessels by reportable segment and fleet as of December 31, 2016 and 2015 follows:      As of December 31, 2016  Net Average Number of  Accumulated Carrying Vessel Age Owned  Cost Depreciation Value (by dwt) Vessels   International Flag Crude Tankers  VLCC (includes ULCC) $ 681,891 $ (235,159) $ 446,732 12.1 9  Aframax 247,863 (66,943) 180,920 11.6 7  Panamax 121,810 (18,506) 103,304 14.3 8  Total International Flag Crude Tankers 1,051,564 (320,608) 730,956 (1) 12.3 24   International Flag Product Carriers  LR2 73,681 (6,601) 67,080 2.4 1  LR1 106,176 (8,474) 97,702 8.1 4  MR 247,519 (45,766) 201,753 11.2 13  Total International Flag Product Carriers 427,376 (60,841) 366,535 (2) 9.3 18   Fleet Total $ 1,478,940 $ (381,449) $ 1,097,491 11.7 42  (1) Includes one ULCC, eight VLCCs, seven Aframaxes and seven Panamaxes with an aggregate carrying value of $722,883 , which the Company believes exceeds their aggregate market values (estimated by taking an average of two third party vessel appraisals) of approximately $556,625 by $166,258 . (2) Includes one LR2, four LR1s and five MRs with an aggregate carrying value of $306,450 , which the Company believes exceeds their aggregate market values (estimated by taking an average of two third party vessel appraisals) of approximately $228,125 , by $78,325 .      As of December 31, 2015  Net Average Number of  Accumulated Carrying Vessel Age Owned  Cost Depreciation Value (by dwt) Vessels   International Flag Crude Tankers  VLCC (includes ULCC) $ 681,834 $ (211,153) $ 470,681 11.1 9  Aframax 270,246 (76,597) 193,649 10.6 7  Panamax 128,613 (14,113) 114,500 13.3 8  Total International Flag Crude Tankers 1,080,693 (301,863) 778,830 11.3 24   International Flag Product Carriers  LR2 73,681 (3,896) 69,785 1.4 1  LR1 197,137 (47,182) 149,955 7.1 4  MR 291,380 (52,016) 239,364 10.2 13  Total International Flag Product Carriers 562,198 (103,094) 459,104 8.1 18   Fleet Total $ 1,642,891 $ (404,957) $ 1,237,934 10.7 42 
Vessel/Fleet [Member]
Property, Plant and Equipment [Line Items]
Schedule of Property Plant and Equipment by Segment	Vessel activity, excluding construction in progress, for the three years ended December 31, 2016 is summarized as follows:      Accumulated Net Book  Vessel Cost Depreciation Value  Balance at January 1, 2014 $ 1,641,573 $ (280,774) $ 1,360,799  Purchases and vessel additions 13,623 -  Transfers from Construction in Progress 62,475 -  Disposals (69,556) 4,809  Depreciation - (65,610)  Balance at December 31, 2014 1,648,115 (341,575) 1,306,540  Purchases and vessel additions 1,531 -  Disposals (6,755) 1,003  Depreciation - (64,385)  Balance at December 31, 2015 1,642,891 (404,957) 1,237,934  Purchases and vessel additions 2,127 -  Depreciation - (63,328)  Impairment (166,078) 86,836  Balance at December 31, 2016 $ 1,478,940 $ (381,449) $ 1,097,491 

EQUITY METHOD INVESTMENTS (Tabl

EQUITY METHOD INVESTMENTS (Tables)	12 Months Ended
	Dec. 31, 2016
Equity Method Investments [Abstract]
Schedule of Equity Method Investments	Financial information for the equity method investees that were significant for the year ended December 31, 2016, adjusted for basis and accounting policy differences, is as follows:     For the year ended December 31, 2016 FSO Asia FSO Africa LNG Others Total  Shipping revenues $ 65,389 $ 65,515 $ 116,547 $ - $ 247,451  Ship operating expenses (29,290) (29,029) (56,195) - (114,514)  Income from vessel operations 36,099 36,486 60,352 - 132,937  Other income 106 15 709 - 830  Interest expense (4,948) (403) (37,660) - (43,011)  Net income 31,257 36,098 23,401 - 90,756   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  Equity in income/(loss) of affiliated companies, before  consolidating and reconciling adjustments $ 15,629 $ 18,049 $ 11,677 $ (28) $ 45,327   Impairment of equity method investments (15,977) (14,498) - - (30,475)  Amortization on deferred gain on 2009 sale  of TI Africa to FSO Joint Venture 1,202 1,207 - - 2,409  Amortization of interest capitalized during  vessel construction - - (419) - (419)  Other - - 7 - 7  Equity in income/(loss) of affiliated companies $ 854 $ 4,758 $ 11,265 $ (28) $ 16,849     For the year ended December 31, 2015 FSO Asia FSO Africa LNG Others Total  Shipping revenues $ 65,097 $ 65,528 $ 114,819 $ - $ 245,444  Ship operating expenses (29,467) (29,937) (54,235) - (113,639)  Income from vessel operations 35,630 35,591 60,584 - 131,805  Other income 38 9 2,311 - 2,358  Interest expense (6,348) (1,221) (39,650) - (47,219)  Net income 29,320 34,379 23,245 - 86,944   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  Equity in income/(loss) of affiliated companies, before  consolidating and reconciling adjustments $ 14,660 $ 17,190 $ 11,599 $ 113 $ 43,562   Amortization on deferred gain on 2009 sale  of TI Africa to FSO Joint Venture 1,202 1,207 - - 2,409  Amortization of interest capitalized during  vessel construction - - (419) - (419)  Other - - 8 (1) 7  Equity in income/(loss) of affiliated companies $ 15,862 $ 18,397 $ 11,188 $ 112 $ 45,559      For the year ended December 31, 2014 FSO Asia FSO Africa LNG Others Total  Shipping revenues $ 64,330 $ 64,611 $ 112,300 $ - $ 241,241  Ship operating expenses (30,172) (32,158) (55,837) - (118,167)  Income from vessel operations 34,158 32,453 56,463 - 123,074  Other income 88 23 94 - 205  Interest expense (7,699) (2,019) (41,622) - (51,340)  Net income 26,547 30,457 14,935 - 71,939   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  Equity in income/(loss) of affiliated companies, before  consolidating and reconciling adjustments $ 13,273 $ 15,228 $ 7,453 $ (79) $ 35,875   Amortization on deferred gain on 2009 sale  of TI Africa to FSO Joint Venture 1,202 1,207 - - 2,409  Amortization of interest capitalized during  vessel construction - - (419) - (419)  Other - - 1 6 7  Equity in income/(loss) of affiliated companies $ 14,475 $ 16,435 $ 7,035 $ (73) $ 37,872  The tables below present the financial position for the equity method investees that were significant in 2016 and a reconciliation of the Company’ s share of the joint ventures’ total equity to the investments in and advances to affiliates line on the consolidated balance sheet s as of December 31, 2016 and 2015:    As of December 31, 2016 FSO Asia FSO Africa LNG Other (1) Total  Cash and cash equivalents $ 23,013 $ 26,928 $ 25,844 $ - $ 75,785  Restricted cash, current portion 13,578 - 13,160 - 26,738  Trade receivables 10,891 10,955 853 - 22,699  Other receivables 407 331 54 - 792  Inventory - - 2,517 - 2,517  Total current assets 47,889 38,214 42,428 - 128,531  Restricted cash, long term portion - - 47,879 - 47,879  Trade receivables 9,824 9,005 - - 18,829  Vessels less accumulated depreciation 309,821 315,295 759,127 - 1,384,243  Deferred drydock expenditures, net - - 2,593 - 2,593  Total Assets $ 367,534 $ 362,514 $ 852,027 $ - $ 1,582,075   Accounts payable and accrued expenses $ 1,557 $ 804 $ 6,103 $ - $ 8,464  Current portion of long term debt 75,208 - 41,699 - 116,907  Current portion of derivative liability 969 1,268 22,545 - 24,782  Total current liabilities 77,734 2,072 70,347 - 150,153  Long-term debt - - 590,985 - 590,985  Long-term derivative liability - - 57,912 - 57,912  Advances from shareholders (2) 131,794 275,231 - - 407,025  Total Liabilities 209,528 277,303 719,244 - 1,206,075  Equity 158,006 85,211 132,783 - 376,000  Total Liabilities and Equity $ 367,534 $ 362,514 $ 852,027 $ - $ 1,582,075   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  INSW Share of affiliate's equity, before  consolidating and reconciling adjustments $ 79,003 $ 42,606 $ 66,259 $ - $ 187,868   Impairment of equity method investments (15,977) (14,498) - - (30,475)  Advances from shareholders 65,897 137,616 - - 203,513  Unamortized deferred gain on 2009 sale  of TI Africa to FSO Africa, net (18,089) (18,496) - - (36,585)  Unamortized interest capitalized during  vessel construction - - 10,693 10,693  Other - - (37) 23,704 23,667  Investments in and advances to affiliated companies $ 110,834 $ 147,228 $ 76,915 $ 23,704 $ 358,681  (1) Primarily relates to working capital deposits that the Company maintains with the commercial pools in which it participates. (2) Such advances are unsecured, interest free and not repayable within one year .     As of December 31, 2015 FSO Asia FSO Africa LNG Other (1) Total  Cash and cash equivalents $ 16,413 $ 880 $ 14,031 $ - $ 31,324  Restricted cash, current portion 14,052 - 13,370 - 27,422  Trade receivables 10,817 10,881 655 - 22,353  Other receivables 466 391 203 - 1,060  Inventory - - 2,148 - 2,148  Total current assets 41,748 12,152 30,407 - 84,307  Restricted cash, long term portion - - 46,199 - 46,199  Trade receivables 7,847 6,895 - - 14,742  Vessels less accumulated depreciation 328,719 334,247 785,523 - 1,448,489  Deferred drydock expenditures, net - - 6,266 - 6,266  Total Assets $ 378,314 $ 353,294 $ 868,395 $ - $ 1,600,003   Liabilities and equity  Current liabilities:  Accounts payable and accrued expenses $ 1,731 $ 797 $ 7,634 $ - $ 10,162  Amounts due to related companies 247 366 - - 613  Current portion of long term debt 28,616 - 39,305 - 67,921  Current portion of derivative liability 2,556 2,541 26,307 - 31,404  Total current liabilities 33,150 3,704 73,246 - 110,100  Long-term debt 75,208 - 631,655 - 706,863  Long-term derivative liability 861 1,246 76,955 - 79,062  Advances from shareholders (2) 144,794 299,231 - - 444,025  Total Liabilities 254,013 304,181 781,856 - 1,340,050  Equity 124,301 49,113 86,539 - 259,953  Total Liabilities and Equity $ 378,314 $ 353,294 $ 868,395 $ - $ 1,600,003   Percentage of ownership in equity investees 50.0% 50.0% 49.9%  INSW Share of affiliate's equity, before  consolidating and reconciling adjustments $ 62,151 $ 24,557 $ 43,183 $ - $ 129,891   Advances from shareholders 72,397 149,616 - - 222,013  Unamortized deferred gain on 2009 sale  of TI Africa to FSO Africa, net (19,292) (19,703) - - (38,995)  Unamortized interest capitalized during  vessel construction - - 11,112 - 11,112  Other - - (36) 20,906 20,870  Investments in and advances to affiliated companies $ 115,256 $ 154,470 $ 54,259 $ 20,906 $ 344,891  (1) Primarily relates to working capital deposits that the Company maintains with the commercial pools in which it participates. (2) Such advances are unsecured, interest free and not repayable within one year .  The tables below present the cash flows for the equity method investees that were significant in 2016 for each of the three years ended December 31, 2016:     Statements of cash flows of FSO Asia for the year ended December 31, 2016 2015 2014   Net cash provided by operating activities $ 47,984 $ 63,813 $ 41,795   Cash flows from investing activities:  Change in restricted cash 474 (35) (29)  Decrease in amounts due from related companies - - 30,000  Net cash provided by/(used in) investing activities 474 (35) 29,971   Cash flows from financing activities:  Repayment of bank loan (28,858) (27,446) (26,103)  Repayment of advances from shareholders (13,000) (37,000) (60,000)  Net cash used in financing activities (41,858) (64,446) (86,103)   Net increase/(decrease) in cash and cash equivalents 6,600 (668) (14,337)  Cash and cash equivalents at beginning of year 16,413 17,081 31,418  Cash and cash equivalents at end of year $ 23,013 $ 16,413 $ 17,081 

VARIABLE INTEREST ENTITIES ("35

VARIABLE INTEREST ENTITIES ("VIEs") (Tables)	12 Months Ended
	Dec. 31, 2016
Variable Interest Entities ("VIEs") [Abstract]
Schedule of Variable Interest Entities	The following table presents the carrying amounts of assets and liabilities in the consolidated balance sheets related to the VIEs described above as of December 31, 2016 and 2015:      Consolidated Balance Sheet as of December 31, 2016 2015  Investments in Affiliated Companies $ 261,403 $ 271,618 
Schedule of Variable Interest Entities Liability in Condensed Consolidated Balance Sheet to Maximum Exposure to Loss	The table below compares the Company’s liability in the consolidated balance sheet to the maximum exposure to loss at December 31, 2016:         Consolidated Balance Sheet Maximum Exposure to Loss  Other Liabilities $ - $ 300,200 

DEBT (Tables)

DEBT (Tables)	12 Months Ended
	Dec. 31, 2016
Schedule of Applicable Margins and Floor Interest Rates Exit Financing Facility	The applicable margins and floor interest rates for each INSW Exit Financing Facility is as follows:    Facility INSW Term Loan INSW Revolver Facility  Rate ABR LIBOR ABR LIBOR  Floor 2.00% 1.00% 2.00% 1.00%  Applicable Margin 3.75% 4.75% 3.50% 4.50% 
Contractual Obligation, Fiscal Year Maturity Schedule	As of December 31, 2016, the aggregate annual principal payments required to be made on the INSW Term Loan are as follows:      Year Amount  2017 $ 6,183  2018 6,183  2019 447,596  Aggregate principal payments required $ 459,962  The following table summarizes interest expense, including amortization of issuance and deferred financing costs, commitment, administrative and other fees, recognized during the years ended December 31, 2016, 2015 and 2014 with respect to the Company’s debt facilities:     Debt facility 2016 2015 2014  Contractual Interest Contractual Interest Contractual Interest Reorganization Expense Total Expense  INSW Facilities, due 2019 $ 38,442 $ 42,688 $ 17,085 $ - $ 17,085  Co-borrower obligation under the unsecured  revolving credit facility (1) - - 11,155 - 11,155  Floating rate secured term loans, due through 2023 (1) - - 20,460 10,083 30,543  Total INSW Facilities interest expense $ 38,442 $ 42,688 $ 48,700 $ 10,083 $ 58,783    (1) The Company repaid the principal outstanding of $217,000 for the co -borrower obligation under the unsecured revolving credit f acility and the Company and OSG repaid principal outstanding amounts of $110,000 and $468,687 , respectively, for the floating rate secured term loans (collectively, the pre-reorganized INSW loan facilities) on the Effective Date.
Schedule of Interest Paid	The following table summarizes interest paid, excluding deferred financing fees paid, capitalized interest and amounts paid under the related party loan agreements (See Note 13, “Related Parties”), during the years ended December 31, 2016, 2015 and 2014 with respect to the Company’s debt facilities:     Debt facility 2016 2015 2014  INSW Facilities, due 2019 $ 33,039 $ 36,368 $ 9,239  Co-borrower obligation under the unsecured revolving credit facility - - 11,496  Floating rate secured term loans, due through 2023 (1) - - 10,314  Total debt related interest expense paid (2) $ 33,039 $ 36,368 $ 31,049  (1) Additionally, OSG paid approximately $838 of interest for the year ended December 31, 2014 relating to its guarantee of the floating rate secured loans, which was deemed a capital contribution for financial reporting purposes. (2) For the year ended December 31, 2014, excludes contractual interest the Company paid of $7,453 and $117 relating to the rejected charters (See Note 16, "Leases") and other obligations, respectively.
Term Loan [Member]
Schedule of Long-term Debt Instruments	Debt consists of the following:      As of December 31, 2016 2015  INSW Term Loan, due 2019, net of unamortized discount  and deferred finance costs of $20,311 and $23,727 $ 439,651 $ 595,222  Less current portion (6,183) (6,284)  Long-term portion $ 433,468 $ 588,938 

FAIR VALUE OF FINANCIAL INSTR37

FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value of Financial Instruments, Derivatives and Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	The estimated fair values of the Company’s financial instruments, other than derivatives that are not measured at fair value on a recurring basis, categorized based upon the fair value hierarchy, at December 31, 2016 and 2015, are as follows:      Fair Value Level 1 Level 2  December 31, 2016:  Cash $ 92,001 $ 92,001 $ -  INSW Term Loan (447,888) - (447,888)   December 31, 2015:  Cash (1) $ 317,847 $ 317,847 $ -  INSW Term Loan (601,928) - (601,928)  (1) Includes non-current restricted cash aggregating $8,989 at December 31, 2015. 
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following tables present information with respect to the fair values of derivatives reflected in the December 31, 2016 and 2015 balance sheets on a gross basis by transaction: Fair Values of Derivative Instruments:     Asset Derivatives Liability Derivatives  Balance Sheet Balance Sheet  Location Amount Location Amount  December 31, 2016:  Derivatives designated as hedging instruments:  Interest rate cap:  Current portion Other assets $ - Other liabilities $ -  Total derivatives designated as hedging instruments $ - $ -   December 31, 2015:  Derivatives designated as hedging instruments:  Interest rate cap:  Long-term portion Other assets $ 2 Other liabilities $ -  Total derivatives designated as hedging instruments $ 2 $ - 
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The effect of cash flow hedging relationships recognized in other comprehensive income/(loss) excluding amounts reclassified from accumulated other comprehensive loss (effective portion), including hedges of equity method investees, for the years ended December 31, 2016, 2015 and 2014 follows:     For the year ended December 31, 2016 2015 2014  Interest rate swaps $ (3,050) $ (9,721) $ (21,487)  Interest rate cap (2) (472) (172)  Total $ (3,052) $ (10,193) $ (21,659)  The effect of cash flow hedging relationships on the consolidated statements of operations is presented excluding hedges of equity method investees. The Company’s interest rate cap agreements had no effect on the consolidated statement of operations for the year ended December 31, 2014. The effect of the Company’s cash flow hedging relationships on the consolidated statement of operations for the years ended December 31, 2016 and 2015 is shown below:      Statement of Operations  Effective Portion of Gain/(Loss)  Reclassified from Accumulated  Other Comprehensive Loss Ineffective Portion  Amount of Amount of  Location Gain/(Loss) Location Gain/(Loss)  For the year ended December 31, 2016:  Interest rate cap Interest expense $ (517) Interest expense $ -  Total $ (517) $ -   For the year ended December 31, 2015:  Interest rate cap Interest expense $ (2) Interest expense $ -  Total $ (2) $ - 
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents the fair values, which are pre-tax, for assets and liabilities measured on a recurring basis (excluding investments in affiliated companies):     Fair Value Level 2  Assets/(Liabilities) at December 31, 2016  Derivative Assets (interest rate cap) $ - $ - (1)   Assets/(Liabilities) at December 31, 2015  Derivative Assets (interest rate cap) $ 2 $ 2 (1) (1) For the interest rate cap, fair value is derived using valuation models that utilize the income valuation approach. These valuation models take into account contract terms such as maturity, as well as other inputs such as interest rate yield curves and creditworthiness of the counterparty and the Company.
Fair Value Measurements, Nonrecurring	The following table summarizes the fair values of assets for which an impairment charge was recognized for the year ended December 31, 2016:     Impairment  Description Fair Value Level 2 Level 3 Charges  International Crude Tankers - Vessels held and used (1) (2) $ 38,828 $ 28,875 $ 9,953 $ (7,786)  International Product Carriers - Vessels held and used (1) (2) $ 89,557 $ 40,000 $ 49,557 $ (71,456)  International Crude Tankers - Equity method investments (3) $ 258,061 $ - $ 258,061 $ (30,475)  (1) Aggregate pre-tax impairment charges of $49,640 related to two vessels in each of the International Crude Tanker and International Product Carriers segments and $29,602 related to one vessel in the International Crude Tanker segment and seven vessels in the International Product Carriers segment were recorded during the three-month periods ended September 30, 2016 and December 31, 2016, respectively. (2) Fair value measurements aggregating $59,510 at December 31, 2016 used to determine the impairment for eight vessels were based on the income approach, which utilized cash flow projections consistent with the most recent projections of the Company and a discount rate equivalent to INSW's weighted average cost of capital. Because the Company uses its own cash flow projections, the cash flow projections are considered to be Level 3. The fair value measurements of $68,875 at September 30, 2016 used to determine impairment for four vessels were based upon a market approach, which considered the expected sales prices of vessels obtained from vessel appraisals. Because sales of vessels occur somewhat infrequently the expected sales prices are considered to be Level 2. (3) Aggregate pre-tax impairment charges of $30,475 related to the Company’s investments in the FSO joint ventures, which are accounted for using the equity method, were recorded during the three-month period ended December 31, 2016. The fair value measurement of $258,061 at December 31, 2016 used to determine the amount of the impairment was based on the income approach, which utilized cash flow projections consistent with the most recent projections of the Company, and a discount rate equivalent to a market participant's weighted average cost of capital. Because the Company uses its own cash flow projections, the cash flow projections are considered to be Level 3.

ACCOUNTS PAYABLE, ACCRUED EXP38

ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2016
ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES [Abstract]
Schedule of Accounts Payable, Accrued Expenses and Other Current Liabilities	   At December 31, 2016 2015  Accounts payable $ 2,866 $ 3,371  Payroll and benefits 5,672 2,154  Interest 4,042 5,636  Due to owners on chartered in vessels 856 2,141  Accrued drydock and repairs 1,608 2,127  Bunkers and lubricants 2,787 820  Charter revenues received in advance 6,725 1,227  Insurance 2,650 1,517  Accrued vessel expenses 6,804 9,086  Accrued general and administrative expenses 2,644 1,107  Other 1,583 1,597  Total accounts payable, accrued expense and other current liabilities $ 38,237 $ 30,783 

TAXES (Tables)

TAXES (Tables)	12 Months Ended
	Dec. 31, 2016
Taxes [Abstract]
Components of Income Tax (Provisions) and Benefits	The components of the income tax provisions follow:      For the year ended December 31, 2016 2015 2014  Current $ 440 $ 140 $ 754  Deferred - - (10)  Total provision for income taxes $ 440 $ 140 $ 744 
Reconcilation of Effective to Statutory Tax Rate	The differences between income taxes expected at the Marshall Islands statutory income tax rate of zero percent and the reported income tax provisions are summarized as follows:     For the year ended December 31, 2016 2015 2014  Marshall Islands statutory income tax rate - % - % - %  Change in valuation allowance 25.29 % - % 0.04 %  Liquidation of subsidiaries (29.53) % - % - %  Income subject to tax in other jurisdictions 1.76 % 0.08 % 0.59 %  Effective income tax rate (2.48) % 0.08 % 0.63 % 
Components of Deferred Tax Liabilities and Assets	The significant components of the Company’s deferred tax liabilities and assets follow:     As of December 31, 2016 2015  Deferred tax assets:  Net operating loss carryforwards 1,711 6,714  Excess of tax over book basis of depreciable assets 548 666  Pensions 3,147 2,519  Other - 5  Total deferred tax assets 5,406 9,904  Less: Valuation allowance (5,406) (9,904)  Deferred tax assets, net - -  Net noncurrent deferred tax assets/(liabilities) $ - $ - 
Reconcilation of Amounts of Unrecognized Tax Benefits	The following is tabular rollforward of the Company’s unrecognized tax benefits (excluding interest and penalties):     2016 2015  Balance of unrecognized tax benefits as of January 1, $ 40 $ 170  Increases for positions taken in prior years 115 -  Decreases for positions taken in prior years - (130)  Changes due to currency translations (2) -  Balance of unrecognized tax benefits as of December 31, $ 153 $ 40 

RELATED PARTIES (Tables)

RELATED PARTIES (Tables)	12 Months Ended
	Dec. 31, 2016
RELATED PARTIES [Abstract]
Schedule of Related Party Transactions	The following tables show certain related party transactions between INSW and OSG:     For the year ended December 31, 2016 2015 2014  Corporate overhead allocations from OSG  General and administrative $ 21,486 $ 36,792 $ 39,570  Depreciation 517 730 1,022  Technical management transition costs - - 21  Separation and transition costs 6,569 - 670  Reorganization items, net 131 5,659 86,179  Total corporate overhead allocations from OSG $ 28,703 $ 43,181 $ 127,462  The outstanding amounts related to the transactions between INSW and OSG were as follows:    As of December 31, 2016 2015  Payable to OSG $ 683 $ 11,350 

CAPITAL STOCK AND STOCK COMPE41

CAPITAL STOCK AND STOCK COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2016
Capital Stock and Stock Compensation [Abstract]
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	Activity with respect to restricted common stock and restricted stock units under INSW compensation plans is summarized as follows:      Common Stock   Nonvested Shares Outstanding at December 31, 2015 -  INSW RSUs issued to replace OSG RSUs 110,294  Granted 32,067  Vested ( $19.04 per share) (25,103)  Forfeited -  Nonvested Shares Outstanding at December 31, 2016 117,258  Activity with respect to stock options under INSW compensation plans is summarized as follows:
Schedule of Share-based Compensation, Stock Options, Activity	    Common Stock   Options Outstanding at December 31, 2015 -  INSW Spin Options issued to replace OSG options 127,559  Forfeited -  Exercised -  Options Outstanding at December 31, 2016 127,559  Options Exercisable at December 31, 2016 26,601 

ACCUMULATED OTHER COMPREHENSI42

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	12 Months Ended
	Dec. 31, 2016
Accumulated Other Comprehensive Loss [Abstract]
Components of Accumulated Other Comprehensive Loss	The components of accumulated other comprehensive loss, net of related taxes, in the consolidated balance sheets follow:      At December 31, 2016 2015  Unrealized losses on derivative instruments $ (40,317) $ (53,446)  Items not yet recognized as a component of net periodic benefit cost (pension plans) (11,950) (10,636)  Foreign currency translation adjustment - (42)  $ (52,267) $ (64,124)  The following tables present the changes in the balances of each component of accumulated other comprehensive loss, net of related taxes, for the three years ended December 31, 2016.     Unrealized losses on cash flow hedges Items not yet recognized as a component of net periodic benefit cost (pension plans) Foreign currency translation adjustment Total   Balance at December 31, 2015 $ (53,446) $ (10,636) $ (42) $ (64,124)  Current period change, excluding amounts reclassified from  accumulated other comprehensive loss (3,052) (2,364) 42 (5,374)  Amounts reclassified from accumulated other  comprehensive loss 16,181 1,050 - 17,231  Total change in accumulated other comprehensive loss 13,129 (1,314) 42 11,857  Balance at December 31, 2016 $ (40,317) $ (11,950) $ - $ (52,267)   Balance at December 31, 2014 $ (61,356) $ (12,988) $ (29) $ (74,373)  Current period change, excluding amounts reclassified from  accumulated other comprehensive loss (10,193) 1,870 (13) (8,336)  Amounts reclassified from accumulated other  comprehensive loss 18,103 482 - 18,585  Total change in accumulated other comprehensive loss 7,910 2,352 (13) 10,249  Balance at December 31, 2015 $ (53,446) $ (10,636) $ (42) $ (64,124)   Balance at December 31, 2013 $ (59,263) $ (8,246) $ (116) $ (67,625)  Current period change, excluding amounts reclassified from  accumulated other comprehensive loss (21,659) (5,069) 87 (26,641)  Amounts reclassified from accumulated other  comprehensive loss 19,566 327 - 19,893  Total change in accumulated other comprehensive loss (2,093) (4,742) 87 (6,748)  Balance at December 31, 2014 $ (61,356) $ (12,988) $ (29) $ (74,373) 
Reclassification Out of Accumulated Other Comprehensive Income (Loss)	The following table presents information with respect to amounts reclassified out of accumulated other comprehensive loss for the three years ended December 31, 2016.    Years Ended December 31,  Accumulated Other Comprehensive Loss Component 2016 2015 2014 Statement of Operations Line Item   Unrealized losses on cash flow hedges:  Interest rate swaps entered into by the Company's Equity in income of  equity method joint venture investees $ (15,664) $ (18,101) $ (19,566) affiliated companies   Interest rate caps entered into by the Company's  subsidiaries (517) (2) - Interest expense   Items not yet recognized as a component of net  periodic benefit cost (pension plans):  Net periodic benefit costs associated with  pension and postretirement benefit plans for General and  shore-based employees (1,050) (482) (335) administrative expenses  (17,231) (18,585) (19,901) Total before tax   - - 8 Tax benefit (1)  $ (17,231) $ (18,585) $ (19,893) Total net of tax (1) The tax benefit relates to the net periodic benefit costs of the Company's pension plans.
Comprehensive Income Tax Expenses (Benefits)	The income tax expense/(benefit) allocated to each component of other comprehensive loss follows:    Tax expense / (benefit) on items not yet recognized as a component of net periodic benefit cost  For the year ended December 31, 2016  Current period change excluding amounts reclassified from accumulated other comprehensive loss $ -  Amounts reclassified from accumulated other comprehensive loss -  Total change in accumulated other comprehensive loss $ -   For the year ended December 31, 2015  Current period change excluding amounts reclassified from accumulated other comprehensive loss $ -  Amounts reclassified from accumulated other comprehensive loss -  Total change in accumulated other comprehensive loss $ -   For the year ended December 31, 2014  Current period change excluding amounts reclassified from accumulated other comprehensive loss $ -  Amounts reclassified from accumulated other comprehensive loss 8  Total change in accumulated other comprehensive loss $ 8 

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2016
Bareboat Charters-In [Member]
Lease [Abstract]
Operating Leases of Lessee Disclosure	The future minimum commitments and related number of operating days under these operating leases are as follows:     Bareboat Charters-in:   At December 31, 2016 Amount Operating Days  2017 $ 7,016 1,063  2018 1,841 279  Net minimum lease payments $ 8,857 1,342 
Charters-Out [Member]
Lease [Abstract]
Operating Leases of Lessee Disclosure	The future minimum revenues, before reduction for brokerage commissions, expected to be received on noncancelable time charters and the related revenue days (revenue days represent calendar days, less days that vessels are not available for employment due to repairs, drydock or lay-up) are as follows:      At December 31, 2016 Amount Revenue Days  2017 $ 30,718 1,504  2018 913 166  Future minimum revenues $ 31,631 1,670 
Property Subject to Operating Lease [Member] | Time Charters-In [Member]
Lease [Abstract]
Schedule of Property Subject to or Available for Operating Lease	Time Charters-in:      At December 31, 2016 Amount Operating Days  2017 $ 15,440 1,488  Net minimum lease payments $ 15,440 1,488 
Property Subject to Operating Lease [Member] | Office Space [Member]
Lease [Abstract]
Schedule of Property Subject to or Available for Operating Lease	In connection with the spin-off, on November 17, 2016, OSG assigned to the Company its interest in the lease agreement the Company’s New York headquarters. The future minimum commitments under all lease obligations for office space are as follows:      At December 31, Amount  2017 $ 1,088  2018 998  2019 998  2020 998  2021 665  Net minimum lease payments $ 4,747 

PENSION AND OTHER POSTRETIREM44

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)	12 Months Ended
	Dec. 31, 2016
Pension and Other Postretirement Benefit Plans [Abstract]
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets	Information with respect to the Scheme for which INSW uses a December 31 measurement date, is as follows:      Pension Benefits  At December 31, 2016 2015  Change in benefit obligation:  Benefit obligation at beginning of year $ 29,899 $ 34,138  Cost of benefits earned (service cost) - -  Interest cost on benefit obligation 932 1,164  Actuarial losses/(gains) 5,525 (2,387)  Benefits paid (603) (1,501)  Settlements (1,579) -  Foreign exchange gains (4,934) (1,515)  Benefit obligation at year end 29,240 29,899  Change in plan assets:  Fair value of plan assets at beginning of year 21,090 22,205  Actual return on plan assets 2,503 175  Employer contributions 7,605 1,161  Benefits paid (603) (1,501)  Settlements (1,775) -  Foreign exchange losses (3,354) (950)  Fair value of plan assets at year end 25,466 21,090  Unfunded status at December 31 $ (3,774) $ (8,809) 
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets	Information for the defined benefit pension plan with accumulated benefit obligations in excess of plan assets follows:      At December 31, 2016 2015  Projected benefit obligation $ 29,240 $ 29,899  Accumulated benefit obligation 29,240 29,899  Fair value of plan assets 25,466 21,090 
Schedule of Net Benefit Costs	   Pension benefits  For the year ended December 31, 2016 2015 2014  Components of expense:  Cost of benefits earned $ - $ - $ 532  Interest cost on benefit obligation 886 1,164 1,333  Expected return on plan assets (951) (1,159) (1,573)  Amortization of prior-service costs 67 79 87  Recognized net actuarial loss 343 403 230  Recognized settlement loss 640 - -  Net periodic benefit cost $ 985 $ 487 $ 609 
Schedule of Expected Benefit Payments	Expected benefit payments are as follows:       Pension benefits  2017 $ 1,015  2018 773  2019 785  2020 798  2021 1,025  Years 2022-2026 5,926  $ 10,322 
Schedule of Changes in Fair Value of Plan Assets	The fair values of the Company’s pension plan assets at December 31, 2016, by asset category are as follows:     Description Fair Value Level 1 Level 2 (1)  Cash and cash equivalents $ 8,303 $ 8,303 $ -  Equity securities:  International companies 15,166 - 15,166  Government debt securities 1,997 - 1,997  Total $ 25,466 $ 8,303 $ 17,163   (1) Quoted prices for the equity and debt securities are not available from an active market source since such investments are index funds. Therefore, the mid-price, which is a price calculated based on the mid-point between the buying and the selling prices of the index funds assets, was used as such mid-prices are considered to be quoted prices for similar assets.
Schedule of Assumptions Used	 The weighted-average assumptions used to determine benefit obligations follow:      Pension benefits At December 31, 2016 2015 Discount rate 2.60% 3.80%  The weighted-average assumptions used to determine net periodic benefit costs follow:        Pension benefits For the year ended December 31, 2016 2015 2014 Discount rate 3.80% 3.55% 4.50% Expected (long-term) return on plan assets 5.62% 5.35% 7.29% Rate of future compensation increases - - - 

2015 AND 2014 QUARTERLY RESUL45

2015 AND 2014 QUARTERLY RESULTS OF OPERATIONS (Tables)	12 Months Ended
	Dec. 31, 2016
2016 AND 2015 QUARTERLY RESULTS OF OPERATIONS [Abstract]
Schedule of Quarterly Financial Information	     Selected Financial Data for the Quarter Ended March 31, June 30, Sept. 30, Dec. 31,  2016  Shipping revenues $ 128,676 $ 103,062 $ 80,771 $ 85,810  Gain/(loss) on disposal of vessels and other property, including impairments 171 - (49,640) (29,734)  Income/(loss) from vessel operations 53,129 29,079 (47,758) (28,509)  Interest expense (10,742) (9,690) (9,519) (9,525)  Reorganization items, net 4,471 (520) (3,849) (233)  Income tax benefit/(provision) (4) (173) 20 (283)  Net income/(loss) (1) 59,890 30,506 (50,862) (57,757)   Basic and Diluted net income/(loss) per share $ 2.05 $ 1.05 $ (1.74) $ (1.98) (1) As discussed in Note 7, "Equity Method Investments," the Company recorded impairment charges of $30,475 in the fourth quarter related to its investment in the FSO Joint Venture.     Selected Financial Data for the Quarter Ended March 31, June 30, Sept. 30, Dec. 31,  2015  Shipping revenues $ 117,450 $ 124,093 $ 131,121 $ 124,970  Gain/(loss) on disposal of vessels and other property, including impairments 1,166 - 3,238 55  Income/(loss) from vessel operations 36,045 47,676 52,982 39,611  Interest expense (10,420) (10,566) (11,050) (10,934)  Reorganization items, net (2,368) (1,187) (953) (1,151)  Income tax benefit/(provision) 236 (95) (27) (254)  Net income/(loss) 35,941 47,690 51,933 37,606   Basic and Diluted net income/(loss) per share $ 1.23 $ 1.64 $ 1.78 $ 1.29 

BASIS OF PRESENTATION AND DES46

BASIS OF PRESENTATION AND DESCRIPTION OF BUSINESS (Narrative) (Details)	Nov. 18, 2016shares	Dec. 31, 2016property$ / sharesshares	Nov. 30, 2016$ / sharesshares	Dec. 31, 2015$ / sharesshares
Schedule of Equity Method Investments [Line Items]
Common stock, shares authorized		100,000,000	100,000,000	100,000,000
Common stock, no par value | $ / shares		$ 0		$ 0
Preferred stock, shares authorized			10,000,000
Preferred stock, no par value | $ / shares			$ 0
Number of vessels in fleet | property		55
Number of vessels owned (including joint ventures) | property		48
Common stock, shares, issued		29,189,454	102.21	29,189,454
Common stock, shares, outstanding		29,189,454	102.21	29,189,454
Warrant [Member]
Schedule of Equity Method Investments [Line Items]
Shares received pursuant to spinoff	0.063327
OSG Inc. [Member] | Common Stock [Member]
Schedule of Equity Method Investments [Line Items]
Shares received pursuant to spinoff	0.3333
OSG Inc. [Member] | Warrant [Member]
Schedule of Equity Method Investments [Line Items]
Shares received pursuant to spinoff	0.3333

CHAPTER 11 FILING AND EMERGEN47

CHAPTER 11 FILING AND EMERGENCE FROM BANKRUPTCY (Narrative) (Details)

3 Months Ended

12 Months Ended

Dec. 31, 2016USD ($)item

Sep. 30, 2016USD ($)

Jun. 30, 2016USD ($)

Mar. 31, 2016USD ($)

Dec. 31, 2015USD ($)

Sep. 30, 2015USD ($)

Jun. 30, 2015USD ($)

Mar. 31, 2015USD ($)

Dec. 31, 2016USD ($)item

Dec. 31, 2015USD ($)

Dec. 31, 2014USD ($)

Aug. 05, 2014USD ($)

Feb. 09, 2006USD ($)

Chapter 11 Filing Going Concern and Other Related Matters [Line Items]

Reorganization items, total

$ 233,000

$ 3,849,000

$ 520,000

$ (4,471,000)

$ 1,151,000

$ 953,000

$ 1,187,000

$ 2,368,000

$ 131,000

$ 5,659,000

$ 104,528,000

Reorganization items settled with cash

0

0

303,739,000

Allocated reorganization items, non-cash

$ 131,000

5,659,000

87,197,000

Number of subsidiaries | item

180

180

Lender Plan [Member]

Chapter 11 Filing Going Concern and Other Related Matters [Line Items]

Debt instrument, face amount

$ 1,500,000,000

INSW Facilities [Member]

Chapter 11 Filing Going Concern and Other Related Matters [Line Items]

Reorganization items, total

$ 10,083,000

Term Loan [Member] | INSW Facilities [Member]

Chapter 11 Filing Going Concern and Other Related Matters [Line Items]

Debt instrument, face amount

$ 628,375,000

OSG Inc. [Member]

Chapter 11 Filing Going Concern and Other Related Matters [Line Items]

Bankruptcy proceedings, date petition for bankruptcy filed

Nov. 14, 2012

Bankruptcy proceedings, court where petition was filed

U.S. Bankruptcy Court for the District of Delaware

Plan of reorganization, date plan is effective

Aug. 5, 2014

Plan of reorganization, date plan filed

Mar. 7, 2014

Reorganization items, total

$ 131,000

$ 5,659,000

INSW Revolver Facility [Member] | INSW Facilities [Member]

Chapter 11 Filing Going Concern and Other Related Matters [Line Items]

Line of credit facility, maximum borrowing capacity

$ 50,000,000

CHAPTER 11 FILING AND EMERGEN48

CHAPTER 11 FILING AND EMERGENCE FROM BANKRUPTCY (Schedule of Reorganization Items, Net) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Chapter 11 Filing Going Concern and Other Related Matters [Abstract]
Allocated trustee fees									$ 74	$ 147	$ 1,929
Allocated professional fees									(3,220)	5,422	81,381
Provision for and expenses incurred on rejected executory contracts including post-petition interest											6,419
Provision for post-petition interest on debt facilities											10,095
2004 Stock Incentive Plan											1,374
Other claims adjustments									3,277	90	3,330
Reorganization Items, net	$ 233	$ 3,849	$ 520	$ (4,471)	$ 1,151	$ 953	$ 1,187	$ 2,368	$ 131	$ 5,659	$ 104,528

SUMMARY OF SIGNIFICANT ACCOUN49

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)	Jun. 03, 2015USD ($)	Dec. 31, 2016USD ($)$ / item	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts receivable		$ 70,000	$ 415,000
Increase in voyage charter revenues				$ 40,454,000
Increase in voyage charter expenses				40,454,000
Amortization of financing costs		6,449,000	5,625,000	1,928,000
Other assets		2,324,000	1,848,000
Long-term debt		433,468,000	588,938,000
INSW Facilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents			$ 8,989,000
Debt instrument, convenant threshold related to net cash proceeds from asset sales	$ 78,000,000	$ 5,000,000
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage		90.00%	82.00%
INSW Revolver Facility [Member] | INSW Facilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred finance costs, gross		$ 1,691,000	$ 1,741,000
Term Loan [Member] | INSW Facilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt instrument, convenant threshold related to net cash proceeds from asset sales		5,000,000
Deferred finance costs, gross		$ 19,827,000	22,866,000
Vessel/Fleet [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life		25 years
Property, plant and equipment salvage, value per ton | $ / item		300
Interest costs capitalized		$ 0	$ 0	$ 0
Other Property [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life		3 years
Other Property [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life		7 years
Drydock [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period for deferred costs		2 years 6 months
Drydock [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period for deferred costs		5 years

EARNINGS PER COMMON SHARE (Narr

EARNINGS PER COMMON SHARE (Narrative) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	11,153
Common stock, shares, issued	29,189,454	29,189,454		102.21
Common stock, shares, outstanding	29,189,454	29,189,454		102.21
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	60,238
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	127,559
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Participaing securities allocated a portion of income	1,489	0	0

EARNINGS PER COMMONS SHARE (Sch

EARNINGS PER COMMONS SHARE (Schedule of Weighted Average Number of Shares) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Earnings per Common Share [Abstract]
Increase in weighted average number of shares outstanding used to calculate basic and diluted net income/(loss) per share amounts	29,157,285	29,157,285
Change in net income/(loss) per share - basic and diluted	$ (1,694,250.98)	$ 1,165,234.16

EARNINGS PER COMMON SHARE (Calc

EARNINGS PER COMMON SHARE (Calculation of EPS) (Details) - USD ($) $ in Thousands	3 Months Ended												5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jul. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earning Per Share [Line Items]
Common Stockholders															$ (18,223)	$ 173,170	$ (119,099)
Net (loss)/income	$ (57,757)		$ (50,862)		$ 30,506		$ 59,890		$ 37,606	$ 51,933	$ 47,690	$ 35,941	$ 888	$ (119,987)	$ (18,223)	$ 173,170	$ (119,099)
Weighted average common shares outstanding:
Basic															29,157,992	29,157,387	29,157,387
Diluted															29,157,992	29,157,387	29,157,387
Common stock - basic and diluted															29,157,992	29,157,387	29,157,387
Parent Company [Member]
Earning Per Share [Line Items]
Net (loss)/income														$ (119,987)
[1]	As discussed in Note 7, "Equity Method Investments," the Company recorded impairment charges of $30,475 in the fourth quarter related to its investment in the FSO Joint Venture.

BUSINESS AND SEGMENT REPORTIN53

BUSINESS AND SEGMENT REPORTING (Reportable Segments Information) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2016USD ($)segment	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									2
Shipping revenues	$ 85,810	$ 80,771	$ 103,062	$ 128,676	$ 124,970	$ 131,121	$ 124,093	$ 117,450	$ 398,319	$ 497,634	$ 517,018
Time charter equivalent revenues									385,045	475,790	346,987
Depreciation and amortization									79,885	81,653	84,931
(Loss)/gain on disposal of vessels and other property, including impairments	(29,734)	$ (49,640)		$ 171	55	$ 3,238		$ 1,166	(79,203)	4,459	9,955
Income/(loss) from vessel operations									125,805	213,410	67,329
Equity in income of affiliated companies									16,849	45,559	37,872
Investments in and advances to affiliated companies	358,681				344,891				358,681	344,891	331,435
Adjusted total assets	1,565,678				1,697,054				1,565,678	1,697,054	1,768,427
Total assets	1,662,521				2,029,950				1,662,521	2,029,950
Expenditures for vessels									1,988	964	21,454
Payments for drydockings									9,258	20,728	12,078
International Crude Tankers Segment [Member]
Segment Reporting Information [Line Items]
Shipping revenues									271,764	324,703	363,331
Time charter equivalent revenues									258,171	304,182	228,296
Depreciation and amortization									52,395	51,347	56,280
(Loss)/gain on disposal of vessels and other property, including impairments									(7,585)	(31)	9,978
Income/(loss) from vessel operations									111,768	157,840	65,462
Equity in income of affiliated companies									5,584	34,371	30,837
Investments in and advances to affiliated companies	266,470				276,839				266,470	276,839	277,815
Adjusted total assets	1,066,184				1,148,361				1,066,184	1,148,361	1,191,490
Expenditures for vessels									691	91	1,437
Payments for drydockings									7,636	13,842	5,286
International Product Carriers Segment [Member]
Segment Reporting Information [Line Items]
Shipping revenues									126,555	172,931	153,665
Time charter equivalent revenues									126,314	171,608	118,669
Depreciation and amortization									26,696	28,763	26,893
(Loss)/gain on disposal of vessels and other property, including impairments									(71,456)	3,231	(44)
Income/(loss) from vessel operations									13,327	56,746	3,386
Investments in and advances to affiliated companies	15,296				13,793				15,296	13,793	11,334
Adjusted total assets	422,579				505,353				422,579	505,353	551,569
Expenditures for vessels									1,297	873	20,017
Payments for drydockings									1,622	6,886	6,792
Other Segments [Member]
Segment Reporting Information [Line Items]
Shipping revenues											22
Time charter equivalent revenues									560		22
Depreciation and amortization									794	1,543	1,758
(Loss)/gain on disposal of vessels and other property, including impairments									(162)	1,259	21
Income/(loss) from vessel operations									710	(1,176)	(1,519)
Equity in income of affiliated companies									11,265	11,188	7,035
Investments in and advances to affiliated companies	76,915				54,259				76,915	54,259	42,286
Adjusted total assets	$ 76,915				$ 43,340				$ 76,915	$ 43,340	$ 25,368

BUSINESS AND SEGMENT REPORTIN54

BUSINESS AND SEGMENT REPORTING (Reconciliation of Time Charter Revenue to Shipping Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business and Segment Reporting [Abstract]
Time charter equivalent revenues									$ 385,045	$ 475,790	$ 346,987
Add: Voyage expenses									13,274	21,844	170,031
Shipping revenues	$ 85,810	$ 80,771	$ 103,062	$ 128,676	$ 124,970	$ 131,121	$ 124,093	$ 117,450	$ 398,319	$ 497,634	$ 517,018

BUSINESS AND SEGMENT REPORTIN55

BUSINESS AND SEGMENT REPORTING (Reconciliation of Income from Vessel Operations to Loss Before Reorganization) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Total income (loss) from vessel operations of all segments									$ 125,805	$ 213,410	$ 67,329
General and administrative expenses									(31,618)	(41,516)	(52,597)
Severance costs											(16,666)
Separation and transition costs									9,043
Technical management transition costs										(39)	(3,417)
(Loss)/gain on disposal of vessels and other property, including impairments	$ (29,734)	$ (49,640)		$ 171	$ 55	$ 3,238		$ 1,166	(79,203)	4,459	9,955
Consolidated income/(loss) from vessel operations	(28,509)	(47,758)	$ 29,079	53,129	39,611	52,982	$ 47,676	36,045	5,941	176,314	4,604
Equity in income of affiliated companies									16,849	45,559	37,872
Interest expense	(9,525)	(9,519)	(9,690)	(10,742)	(10,934)	(11,050)	(10,566)	(10,420)	(39,476)	(42,970)	(56,258)
Reorganization items, net	$ (233)	$ (3,849)	$ (520)	$ 4,471	$ (1,151)	$ (953)	$ (1,187)	$ (2,368)	(131)	(5,659)	(104,528)
Income/(Loss) before Income Taxes									(17,783)	173,310	(118,355)
Vessel Operations [Member]
Total income (loss) from vessel operations of all segments									125,805	213,410	67,329
General and administrative expenses									(31,618)	(41,516)	(52,597)
Severance costs											(16,666)
Separation and transition costs									9,043
Technical management transition costs										(39)	(3,417)
(Loss)/gain on disposal of vessels and other property, including impairments									(79,203)	4,459	9,955
Consolidated income/(loss) from vessel operations									5,941	176,314	4,604
Equity in income of affiliated companies									16,849	45,559	37,872
Other expense									(966)	66	(45)
Interest expense									(39,476)	(42,970)	(56,258)
Reorganization items, net									(131)	(5,659)	(104,528)
Income/(Loss) before Income Taxes									$ (17,783)	$ 173,310	$ (118,355)

BUSINESS AND SEGMENT REPORTIN56

BUSINESS AND SEGMENT REPORTING (Reconcilation of Assets of Segments to Consolidated Amounts) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Adjusted total assets	$ 1,565,678	$ 1,697,054	$ 1,768,427
Cash and cash equivalents	92,001	308,858	178,240	$ 173,943
Total assets	1,662,521	2,029,950
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Restricted cash		8,989
Unrestricted cash	92,001	308,858
Other Segments [Member]
Segment Reporting Information [Line Items]
Adjusted total assets	76,915	43,340	$ 25,368
Other unallocated amounts	4,842	15,049
Operating Segments [Member]
Segment Reporting Information [Line Items]
Adjusted total assets	$ 1,565,678	$ 1,697,054

BUSINESS AND SEGMENT REPORTIN57

BUSINESS AND SEGMENT REPORTING (Additional Information) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Vessels Deferred Dry Dock and Other Property	$ 1,130,607	$ 1,277,486	$ 1,345,863
International Crude Tankers Segment [Member]
Segment Reporting Information [Line Items]
Vessels Deferred Dry Dock and Other Property	753,028	804,514	837,950
International Product Carriers Segment [Member]
Segment Reporting Information [Line Items]
Vessels Deferred Dry Dock and Other Property	377,095	472,675	499,822
Other Segments [Member]
Segment Reporting Information [Line Items]
Vessels Deferred Dry Dock and Other Property	$ 484	$ 297	$ 8,091

VESSELS, DEFERRED DRYDOCK AND58

VESSELS, DEFERRED DRYDOCK AND OTHER PROPERTY (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets held-for-use		$ 79,242
Payments to acquire equipment		1,988	$ 964	$ 21,454
Gain (loss) on disposition of property		39	4,459	9,955
2 Long Range (LRs), 1 Aframax and 1 Panamax [Member]
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets held-for-use	$ 49,640
One Medium Range Vessel [Member]
Property, Plant and Equipment [Line Items]
Gain (loss) on disposition of property			$ 3,236
5 International Flag Crude Tankers, 2 (VLCC), 1 Panamax and 2 Aframax [Member].
Property, Plant and Equipment [Line Items]
Gain (loss) on disposition of property				$ 10,325
1 Panamax and 7 MRs Vessels [Member]
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets held-for-use		29,602
INSW Facilities [Member]
Property, Plant and Equipment [Line Items]
Debt instrument, collateral amount		$ 1,092,072

VESSELS, DEFERRED DRYDOCK AND59

VESSELS, DEFERRED DRYDOCK AND OTHER PROPERTY (Vessels and Other Property) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Net Carrying Value	$ 1,100,050	$ 1,240,411
Vessel/Fleet and Other Property [Member]
Property, Plant and Equipment [Line Items]
Net Carrying Value	1,100,050	1,240,411
Vessel/Fleet [Member]
Property, Plant and Equipment [Line Items]
Cost	1,478,940	1,642,891	$ 1,648,115	$ 1,641,573
Accumulated Depreciation	(381,449)	(404,957)	(341,575)	(280,774)
Net Carrying Value	1,097,491	1,237,934	$ 1,306,540	$ 1,360,799
Other Property [Member]
Property, Plant and Equipment [Line Items]
Cost	8,680	8,126
Accumulated Depreciation	(6,121)	(5,649)
Net Carrying Value	$ 2,559	$ 2,477

VESSELS, DEFERRED DRYDOCK AND60

VESSELS, DEFERRED DRYDOCK AND OTHER PROPERTY (Breakdown of Vessel Carrying Value) (Details) $ in Thousands	Jan. 14, 2014property	Jan. 12, 2014property	Dec. 31, 2016USD ($)item		Dec. 31, 2015USD ($)item	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Property, Plant and Equipment [Line Items]
Net Carrying Value			$ 1,100,050		$ 1,240,411
Number of owned vessels | property	46	33
Vessel/Fleet [Member]
Property, Plant and Equipment [Line Items]
Cost			1,478,940		1,642,891	$ 1,648,115	$ 1,641,573
Accumulated Depreciation			(381,449)		(404,957)	(341,575)	(280,774)
Net Carrying Value			$ 1,097,491		$ 1,237,934	$ 1,306,540	$ 1,360,799
Average Vessel Age			11 years 8 months 12 days		10 years 8 months 12 days
Number of owned vessels | item			42		42
International Crude Tankers Segment [Member]
Property, Plant and Equipment [Line Items]
Cost			$ 1,051,564		$ 1,080,693
Accumulated Depreciation			(320,608)		(301,863)
Net Carrying Value			$ 730,956	[1]	$ 778,830
Average Vessel Age			12 years 3 months 18 days		11 years 3 months 18 days
Number of owned vessels | item			24		24
International Crude Tankers Segment [Member] | VLCCs (included ULCC) [Member]
Property, Plant and Equipment [Line Items]
Cost			$ 681,891		$ 681,834
Accumulated Depreciation			(235,159)		(211,153)
Net Carrying Value			$ 446,732		$ 470,681
Average Vessel Age			12 years 1 month 6 days		11 years 1 month 6 days
Number of owned vessels | item			9		9
International Crude Tankers Segment [Member] | Aframaxes (LR2) [Member]
Property, Plant and Equipment [Line Items]
Cost			$ 247,863		$ 270,246
Accumulated Depreciation			(66,943)		(76,597)
Net Carrying Value			$ 180,920		$ 193,649
Average Vessel Age			11 years 7 months 6 days		10 years 7 months 6 days
Number of owned vessels | item			7		7
International Crude Tankers Segment [Member] | Panamaxes (LR1) [Member]
Property, Plant and Equipment [Line Items]
Cost			$ 121,810		$ 128,613
Accumulated Depreciation			(18,506)		(14,113)
Net Carrying Value			$ 103,304		$ 114,500
Average Vessel Age			14 years 3 months 18 days		13 years 3 months 18 days
Number of owned vessels | item			8		8
International Crude Tankers Segment [Member] | 1 Ultra Large Crude Carriers (ULCC), 8 Very Large Crude Carriers (VLCC), 7 Aframaxes and 7 Panamaxes [Member]
Property, Plant and Equipment [Line Items]
Net Carrying Value			$ 722,883
Property, plant and equipment, fair value			556,625
Pledged collateral market value over carrying value difference			166,258
International Product Carriers Segment [Member]
Property, Plant and Equipment [Line Items]
Cost			427,376		$ 562,198
Accumulated Depreciation			(60,841)		(103,094)
Net Carrying Value			$ 366,535	[2]	$ 459,104
Average Vessel Age			9 years 3 months 18 days		8 years 1 month 6 days
Number of owned vessels | item			18		18
International Product Carriers Segment [Member] | Aframaxes (LR2) [Member]
Property, Plant and Equipment [Line Items]
Cost			$ 73,681		$ 73,681
Accumulated Depreciation			(6,601)		(3,896)
Net Carrying Value			$ 67,080		$ 69,785
Average Vessel Age			2 years 4 months 24 days		1 year 4 months 24 days
Number of owned vessels | item			1		1
International Product Carriers Segment [Member] | Panamaxes (LR1) [Member]
Property, Plant and Equipment [Line Items]
Cost			$ 106,176		$ 197,137
Accumulated Depreciation			(8,474)		(47,182)
Net Carrying Value			$ 97,702		$ 149,955
Average Vessel Age			8 years 1 month 6 days		7 years 1 month 6 days
Number of owned vessels | item			4		4
International Product Carriers Segment [Member] | MR Vessel [Member]
Property, Plant and Equipment [Line Items]
Cost			$ 247,519		$ 291,380
Accumulated Depreciation			(45,766)		(52,016)
Net Carrying Value			$ 201,753		$ 239,364
Average Vessel Age			11 years 2 months 12 days		10 years 2 months 12 days
Number of owned vessels | item			13		13
International Product Carriers Segment [Member] | 1 LR2, 4 LR1s and 5 MRs Vessels [Member]
Property, Plant and Equipment [Line Items]
Net Carrying Value			$ 306,450
Property, plant and equipment, fair value			228,125
Pledged collateral market value over carrying value difference			$ 78,325
[1]	Includes one ULCC, eight VLCCs, seven Aframaxes and seven Panamaxes with an aggregate carrying value of $722,883, which the Company believes exceeds their aggregate market values (estimated by taking an average of two third party vessel appraisals) of approximately $556,625 by $166,258.
[2]	Includes one LR2, four LR1s and five MRs with an aggregate carrying value of $306,450, which the Company believes exceeds their aggregate market values (estimated by taking an average of two third party vessel appraisals) of approximately $228,125, by $78,325.

VESSELS, DEFERRED DRYDOCK AND61

VESSELS, DEFERRED DRYDOCK AND OTHER PROPERTY (Vessel Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Book Value
Beginning Balance	$ 1,240,411
Ending Balance	1,100,050	$ 1,240,411
Vessel/Fleet [Member]
Vessel Cost
Beginning Balance	1,642,891	1,648,115	$ 1,641,573
Purchases and vessel additions	2,127	1,531	13,623
Transfers from construction in progress			62,475
Disposals		(6,755)	(69,556)
Impairment	(166,078)
Ending Balance	1,478,940	1,642,891	1,648,115
Accumulated Depreciation
Beginning Balance	(404,957)	(341,575)	(280,774)
Disposals		1,003	4,809
Depreciation	(63,328)	(64,385)	(65,610)
Impairment	86,836
Ending Balance	(381,449)	(404,957)	(341,575)
Net Book Value
Beginning Balance	1,237,934	1,306,540	1,360,799
Ending Balance	$ 1,097,491	$ 1,237,934	$ 1,306,540

VESSELS, DEFERRED DRYDOCK AND62

VESSELS, DEFERRED DRYDOCK AND OTHER PROPERTY (Drydocking Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Vessels, Deferred Drydock and Other Property [Abstract]
Beginning Balance	$ 37,075	$ 29,325	$ 36,053
Additions	8,822	22,981	12,078
Sub-total	45,897	52,306	48,131
Drydock amortization	(15,340)	(15,231)	(16,441)
Amounts recognized upon sale/redelivery of vessels and non-cash adjustments			(2,365)
Ending Balance	$ 30,557	$ 37,075	$ 29,325

EQUITY METHOD INVESTMENTS (Narr

EQUITY METHOD INVESTMENTS (Narrative) (Details)	1 Months Ended	12 Months Ended
	Nov. 30, 2004m³	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Schedule of Equity Method Investments [Line Items]
Effective portion of gain/(loss) reclassified from accumulated other comprehensive loss			$ (2,000)
Investments in and advances to affiliated companies		$ 358,681,000	344,891,000
Non-recourse debt		638,827,000	678,132,000
Income (loss) from equity method investments		16,849,000	45,559,000	$ 37,872,000
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Long-term debt		$ 714,170,000	782,333,000
FSO Africa [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		50.00%
FSO Asia [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		50.00%
Liquid Natural Gas Carrier Vessel [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		49.90%
Euronav Nv / FSO Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Line of credit facility, amount outstanding		$ 75,343,000	104,200,000
Other than temporary impairment - Equity method investment, Impairment Charges		30,475,000
Euronav Nv / FSO Joint Venture [Member] | Interest Rate Swap [Member]
Schedule of Equity Method Investments [Line Items]
Notional amount of interest rate cash flow hedge derivatives		$ 145,432,000	$ 201,346,000
Derivative, fixed interest rate		3.90%	3.90%
Euronav Nv / FSO Joint Venture [Member] | FSO Asia and FSO Africa [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		50.00%
Guarantor obligations, current carrying value		$ 0	$ 0
Interest rate cash flow hedge liability at fair value		2,236,000	7,203,000
Guarantor obligations, maximum exposure, undiscounted		38,789,000
Euronav Nv / FSO Joint Venture [Member] | FSO Asia and FSO Africa [Member] | Interest Rate Swap [Member]
Schedule of Equity Method Investments [Line Items]
Effective portion of gain/(loss) reclassified from accumulated other comprehensive loss		111,000	$ 1,334,000
Euronav Nv / FSO Joint Venture [Member] | FSO Africa [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			50.00%	50.00%
Other than temporary impairment - Equity method investment, Impairment Charges		14,498,000
Euronav Nv / FSO Joint Venture [Member] | FSO Africa [Member] | Interest Rate Swap [Member]
Schedule of Equity Method Investments [Line Items]
Losses on discontinuation of interest rate cash flow hedge due to forecasted transaction probable of not occurring, net		133,000	$ 435,000	$ 470,000
Euronav Nv / FSO Joint Venture [Member] | FSO Asia [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			50.00%	50.00%
Other than temporary impairment - Equity method investment, Impairment Charges		15,977,000
Euronav Nv / FSO Joint Venture [Member] | Liquid Natural Gas Carrier Vessel [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage				49.90%
LNG Joint Venture [Member] | Liquid Natural Gas Carrier Vessel [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.90%		49.90%
Line of credit facility, amount outstanding		638,827,000	$ 678,132,000
Storage volume, per carrier | m³	216,200
Initial term of contract	25 years
LNG Joint Venture [Member] | Liquid Natural Gas Carrier Vessel [Member] | Interest Rate Swap [Member]
Schedule of Equity Method Investments [Line Items]
Notional amount of interest rate cash flow hedge derivatives		$ 617,636,000	$ 656,400,000
Derivative, fixed interest rate		4.90%	4.90%
Interest rate cash flow hedge liability at fair value		$ 80,458,000	$ 103,262,000
Effective portion of gain/(loss) reclassified from accumulated other comprehensive loss		$ 40,076,000	$ 51,467,000
Term Loan [Member] | Euronav Nv / FSO Joint Venture [Member] | FSO Asia and FSO Africa [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor obligations, liquidation proceeds, percentage		50.00%

EQUITY METHOD INVESTMENTS (Equi

EQUITY METHOD INVESTMENTS (Equity Method Investments Income Schedule) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2004
Equity in net income of affiliated companies, before consolidating and reconciling adjustments			$ 35,875
Amortization on deferred gain on 2009 sale of TI Africa to FSO Joint Venture			2,409
Amortization of interest capitalized during vessel construction			(419)
Other			7
Net income		$ 45,559	37,872
Euronav NV FSO Joint Venture And LNG Joint Venture And Other Equity Method Invesments [Member]
Shipping revenues	$ 247,451	245,444	241,241
Ship operating expenses	(114,514)	(113,639)	(118,167)
Income from vessel operations	132,937	131,805	123,074
Other income/(expense)	830	2,358	205
Interest expense	(43,011)	(47,219)	(51,340)
Net income	90,756	86,944	71,939
Euronav NV FSO Joint Venture And LNG Joint Venture And Other Equity Method Invesments [Member]
Equity in net income of affiliated companies, before consolidating and reconciling adjustments	45,327	43,562
Amortization on deferred gain on 2009 sale of TI Africa to FSO Joint Venture	2,409	2,409
Amortization of interest capitalized during vessel construction	(419)	(419)
Other	7	7
Net income	16,849
Impairment of equity method investments	(30,475)
Euronav NV FSO Joint Venture And LNG Joint Venture And Other Equity Method Invesments [Member] | Euronav NV FSO Joint Venture And LNG Joint Venture And Other Equity Method Invesments [Member]
Impairment of equity method investments	(30,475)
Euronav Nv / FSO Joint Venture [Member]
Impairment of equity method investments	(30,475)
Other Equity Method Investments [Member]
Equity in net income of affiliated companies, before consolidating and reconciling adjustments	(28)	113	(79)
Other		(1)	6
Net income	$ (28)	112	$ (73)
FSO Asia and FSO Africa [Member] | Euronav Nv / FSO Joint Venture [Member]
Equity method investment, ownership percentage	50.00%
FSO Africa [Member]
Equity method investment, ownership percentage	50.00%
Net income		$ 18,397
FSO Africa [Member] | Euronav Nv / FSO Joint Venture [Member]
Equity method investment, ownership percentage		50.00%	50.00%
Equity in net income of affiliated companies, before consolidating and reconciling adjustments	$ 18,049	$ 17,190	$ 15,228
Amortization on deferred gain on 2009 sale of TI Africa to FSO Joint Venture	1,207	1,207	1,207
Net income	4,758		$ 16,435
Impairment of equity method investments	$ (14,498)
FSO Asia [Member]
Equity method investment, ownership percentage	50.00%
Net income		$ 15,862
FSO Asia [Member] | Euronav Nv / FSO Joint Venture [Member]
Equity method investment, ownership percentage		50.00%	50.00%
Equity in net income of affiliated companies, before consolidating and reconciling adjustments	$ 15,629	$ 14,660	$ 13,273
Amortization on deferred gain on 2009 sale of TI Africa to FSO Joint Venture	1,202	1,202	1,202
Net income	854		$ 14,475
Impairment of equity method investments	$ (15,977)
Liquid Natural Gas Carrier Vessel [Member]
Equity method investment, ownership percentage	49.90%
Net income		$ 11,188
Liquid Natural Gas Carrier Vessel [Member] | Euronav Nv / FSO Joint Venture [Member]
Equity method investment, ownership percentage			49.90%
Liquid Natural Gas Carrier Vessel [Member] | LNG Joint Venture [Member]
Equity method investment, ownership percentage		49.90%		49.90%
Equity in net income of affiliated companies, before consolidating and reconciling adjustments	$ 11,677	$ 11,599	$ 7,453
Amortization of interest capitalized during vessel construction	(419)	(419)	(419)
Other	7	$ 8	1
Net income	$ 11,265		$ 7,035

EQUITY METHOD INVESTMENTS (Eq65

EQUITY METHOD INVESTMENTS (Equity Method Investments Balance Sheet Schedule) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2004
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total		$ 358,681,000	$ 344,891,000
Euronav NV FSO Joint Venture And LNG Joint Venture And Other Equity Method Invesments [Member]
Cash and cash equivalents		75,785,000	31,324,000
Restricted cash, current portion		26,738,000	27,422,000
Trade receivables, current		22,699,000	22,353,000
Other receivable		792,000	1,060,000
Inventory		2,517,000	2,148,000
Current assets		128,531,000	84,307,000
Restricted cash, long term portion		47,879,000	46,199,000
Trade receivable, noncurrent		18,829,000	14,742,000
Vessels less accumulated depreciation		1,384,243,000	1,448,489,000
Deferred drydock expenditures, net		2,593,000	6,266,000
Total assets		1,582,075,000	1,600,003,000
Accounts payable and accrued expenses		8,464,000	10,162,000
Amounts due to related companies			613,000
Current portion of long term debt		116,907,000	67,921,000
Current portion of derviative liability		24,782,000	31,404,000
Current liabilities		150,153,000	110,100,000
Long-term debt		590,985,000	706,863,000
Long-term derivative liability		57,912,000	79,062,000
Loan from Shareholders	[1]	407,025,000	444,025,000
Total Liabilities		1,206,075,000	1,340,050,000
Equity		376,000,000	259,953,000
Total liabilities and equity		$ 1,582,075,000	1,600,003,000
FSO Africa [Member]
Equity method investment, ownership percentage		50.00%
FSO Asia [Member]
Equity method investment, ownership percentage		50.00%
Liquid Natural Gas Carrier Vessel [Member]
Equity method investment, ownership percentage		49.90%
Euronav NV FSO Joint Venture And LNG Joint Venture And Other Equity Method Invesments [Member]
Impairment of equity method investments		$ (30,475,000)
Euronav NV FSO Joint Venture And LNG Joint Venture And Other Equity Method Invesments [Member] | Euronav NV FSO Joint Venture And LNG Joint Venture And Other Equity Method Invesments [Member]
INSW Share of affiliate's equity, before consolidating and reconciling adjustments		187,868,000	129,891,000
Impairment of equity method investments		(30,475,000)
Advances from shareholders		203,513,000	222,013,000
Unamortized deferred gain on 2009 sale of TI Africa to FSO Africa, net		(36,585,000)	(38,995,000)
Unamortized interest capitalized during vessel construction		10,693,000	11,112,000
Other		23,667,000	20,870,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total		358,681,000	$ 344,891,000
Euronav Nv / FSO Joint Venture [Member]
Impairment of equity method investments		$ (30,475,000)
Euronav Nv / FSO Joint Venture [Member] | FSO Asia and FSO Africa [Member]
Equity method investment, ownership percentage		50.00%
Euronav Nv / FSO Joint Venture [Member] | FSO Africa [Member]
Equity method investment, ownership percentage			50.00%	50.00%
Impairment of equity method investments		$ (14,498,000)
Euronav Nv / FSO Joint Venture [Member] | FSO Asia [Member]
Equity method investment, ownership percentage			50.00%	50.00%
Impairment of equity method investments		(15,977,000)
Euronav Nv / FSO Joint Venture [Member] | Liquid Natural Gas Carrier Vessel [Member]
Equity method investment, ownership percentage				49.90%
LNG Joint Venture [Member] | Liquid Natural Gas Carrier Vessel [Member]
Equity method investment, ownership percentage			49.90%		49.90%
Other Equity Method Investments [Member]
Other	[2]	23,704,000	$ 20,906,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	[2]	$ 23,704,000	$ 20,906,000
[1]	Such advances are unsecured, interest free and not repayable within one year.
[2]	Primarily relates to working capital deposits that the Company maintains with the commercial pools in which it participates.

EQUITY METHOD INVESTMENTS (Eq66

EQUITY METHOD INVESTMENTS (Equity Method Investments Cash Flow Schedule) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Euronav Nv / FSO Joint Venture [Member] | FSO Africa [Member]
Net cash provided by operating activities	$ 50,048	$ 48,131	$ 38,224
Net cash provided by/(used in) investing activities		13,080	(24)
Repayment of bank loan		(13,750)	(25,000)
Repayment of advances from shareholders	(24,000)	(38,000)
Change in restricted cash		13,080	(24)
Decrease in amounts due to related companies		(17,520)	(30,000)
Net cash used in financing activities	(24,000)	(69,270)	(55,000)
Net increase/(decrease) in cash and cash equivalents	26,048	(8,059)	(16,800)
Cash and cash equivalents at beginning of year	880	8,939	25,739
Cash and cash equivalents at end of year	26,928	880	8,939
Euronav Nv / FSO Joint Venture [Member] | FSO Asia [Member]
Net cash provided by operating activities	47,984	63,813	41,795
Decrease in amounts due from related parties			30,000
Net cash provided by/(used in) investing activities	474	(35)	29,971
Repayment of bank loan	(28,858)	(27,446)	(26,103)
Repayment of advances from shareholders	(13,000)	(37,000)	(60,000)
Change in restricted cash	474	(35)	(29)
Net cash used in financing activities	(41,858)	(64,446)	(86,103)
Net increase/(decrease) in cash and cash equivalents	6,600	(668)	(14,337)
Cash and cash equivalents at beginning of year	16,413	17,081	31,418
Cash and cash equivalents at end of year	23,013	16,413	17,081
LNG Joint Venture [Member] | Liquid Natural Gas Carrier Vessel [Member]
Net cash provided by operating activities	52,587	56,012	45,287
Net cash provided by/(used in) investing activities	(1,469)	(1,927)	(1,469)
Repayment of bank loan	(39,305)	(37,246)	(35,198)
Change in restricted cash	(1,469)	(1,927)	(1,469)
Cash dividends paid		(12,000)	(10,000)
Net cash used in financing activities	(39,305)	(49,246)	(45,198)
Net increase/(decrease) in cash and cash equivalents	11,813	4,839	(1,380)
Cash and cash equivalents at beginning of year	14,031	9,192	10,572
Cash and cash equivalents at end of year	$ 25,844	$ 14,031	$ 9,192

VARIABLE INTEREST ENTITIES ("67

VARIABLE INTEREST ENTITIES ("VIEs") (Narrative) (Details) $ in Thousands	Dec. 31, 2016USD ($)item	Dec. 31, 2015USD ($)
Variable Interest Entity [Line Items]
Number of commercial pools | item	6
Number of joint ventures | item	3
Accounts receivable, net, current | $	$ 66,918	$ 74,951
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Accounts receivable, net, current | $	$ 9,985

VARIABLE INTEREST ENTITIES ("68

VARIABLE INTEREST ENTITIES ("VIEs") (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Investments in Affiliated Companies	$ 358,681	$ 344,891	$ 331,435
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investments in Affiliated Companies	$ 261,403	$ 271,618

VARIABLE INTEREST ENTITIES ("69

VARIABLE INTEREST ENTITIES ("VIEs") (Schedule of Variable Interest Entities Liability in Condensed Consolidated Balance Sheet to Maximum Exposure to Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Other Liabilities	$ 4,438	$ 8,809
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	$ 300,200

DEBT (Exit Financing Facilities

DEBT (Exit Financing Facilities) (Narrative) (Details) - USD ($)	Jun. 03, 2015	Dec. 31, 2016	Sep. 20, 2016	Aug. 05, 2014
INSW Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		2.00%
Debt instrument, commitment fee rate		0.50%
Debt instrument, convenant threshold related to net cash proceeds from asset sales	$ 78,000,000	$ 5,000,000
Debt instrument, maximum amount of cash dividend	$ 200,000,000
INSW Facilities [Member] | 1-Month London Interbank Offered Rate LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.00%
INSW Facilities [Member] | Federal Funds Effective Swap Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.50%
Third Amended INSW Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, maximum amount related to increase in borrowings		$ 75,000,000	$ 200,000,000
Debt instrument, maximum amount of cash dividend			$ 100,000,000
Incremental Term Loan and Incremental Revolving Commitments [Member]
Debt Instrument [Line Items]
Debt instrument, maximum amount related to increase in borrowings		200,000,000
INSW Revolver Facility [Member] | INSW Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 50,000,000
Line of credit facility, current borrowing capacity		0
Term Loan [Member] | INSW Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 628,375,000
Debt instrument, amortization, quarterly percentage of original principal amount				1.00%
Debt instrument, convenant threshold related to net cash proceeds from asset sales		$ 5,000,000
Debt instrument, additional mandatory prepayments, percentage		50.00%

DEBT (Debt Modifications, Repur

DEBT (Debt Modifications, Repurchases and Extinguishments) (Narrative) (Details) - USD ($) $ in Thousands	Sep. 20, 2016	Jun. 03, 2015	Sep. 30, 2016	Nov. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2017	Dec. 31, 2014
Debt Instrument [Line Items]
Repayments of long-term debt			$ 75,000
Debt instrument, covenant related to base Available Amount					$ 30,200
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Debt instrument, covenant related to base Available Amount							$ 70,236
OSG Inc. [Member]
Debt Instrument [Line Items]
Cash dividends paid to parent company			$ 100,000	$ 102,000
INSW Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, maximum amount of cash dividend		$ 200,000
Debt instrument, convenant threshold related to net cash proceeds from asset sales		$ 78,000			5,000
Debt instrument, covenant requirement, threshold amount related to fair value of collateralized assets					500,000
Payments of financing costs					8,273	$ 5,545
Payments of debt issuance costs					1,153
Deferred financing costs								$ 26,616
Third Amended INSW Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, maximum amount of cash dividend	$ 100,000
Debt instrument, maximum amount related to increase in borrowings	200,000				75,000
Repayments of long-term debt	$ 75,000
Incremental Term Loan and Incremental Revolving Commitments [Member]
Debt Instrument [Line Items]
Debt instrument, maximum amount related to increase in borrowings					200,000
Term Loan [Member] | INSW Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, convenant threshold related to net cash proceeds from asset sales					5,000
Repayments of long-term debt					83,832
Debt instrument, repurchase amount					68,922
Loss on repurchase of debt					1,342
Write off of deferred debt issuance cost					5,097
G & A expenses, other, open market debt repurchase legal and consulting fees					$ 225
Debt instrument, maturity date					Aug. 5, 2019
INSW Revolver Facility [Member] | INSW Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date					Feb. 5, 2019

DEBT (Schedule of Long-term Deb

DEBT (Schedule of Long-term Debt Instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Less current portion	$ (6,183)	$ (6,284)
Long-term portion	433,468	588,938
Term Loan [Member] | INSW Facilities [Member]
Long-term debt	$ 459,962
Debt instrument, maturity date	Aug. 5, 2019
Term Loan [Member] | INSW Facilities, due 2019 [Member]
Long-term debt	$ 439,651	595,222
Less current portion	(6,183)	(6,284)
Long-term portion	433,468	588,938
Unamortized discount and deferred finance costs	$ 20,311	$ 23,727

DEBT (Schedule of Applicable Ma

DEBT (Schedule of Applicable Margins and Floor Interest Rates Exit Financing Facility) (Details) - INSW Facilities [Member]	12 Months Ended
	Dec. 31, 2016
INSW Revolver Facility [Member] | Base Rate [Member] | Floor [Member]
Debt instrument, basis spread on variable rate	2.00%
INSW Revolver Facility [Member] | Base Rate [Member] | Applicable Margin [Member]
Debt instrument, basis spread on variable rate	3.50%
INSW Revolver Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Floor [Member]
Debt instrument, basis spread on variable rate	1.00%
INSW Revolver Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Applicable Margin [Member]
Debt instrument, basis spread on variable rate	4.50%
Term Loan [Member] | Base Rate [Member] | Floor [Member]
Debt instrument, basis spread on variable rate	2.00%
Term Loan [Member] | Base Rate [Member] | Applicable Margin [Member]
Debt instrument, basis spread on variable rate	3.75%
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Floor [Member]
Debt instrument, basis spread on variable rate	1.00%
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Applicable Margin [Member]
Debt instrument, basis spread on variable rate	4.75%

DEBT (Contractual Obligation, F

DEBT (Contractual Obligation, Fiscal Year Maturity Schedule Table 1) (Details) - Term Loan [Member] - INSW Facilities [Member] $ in Thousands	Dec. 31, 2016USD ($)
Shedule Of Long Term Debt Maturities Repayments Of Principal [Line Items]
2,017	$ 6,183
2,018	6,183
2,019	447,596
Long-term Debt	$ 459,962

DEBT (Contractual Obligation,75

DEBT (Contractual Obligation, Fiscal Year Maturity Schedule Table 2) (Details) - USD ($) $ in Thousands		Aug. 05, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reorganization expense			$ 233	$ 3,849	$ 520	$ (4,471)	$ 1,151	$ 953	$ 1,187	$ 2,368	$ 131	$ 5,659	$ 104,528
Repayments of secured debt											65,167
INSW Facilities [Member]
Contractual interest (including default interest)											38,442	42,688	48,700
Reorganization expense													10,083
Debtor Reorganization Items, Provision for Expected Allowed Claims													58,783
INSW Facilities, due 2019 [Member]
Contractual interest (including default interest)											38,442	42,688	17,085
Debtor Reorganization Items, Provision for Expected Allowed Claims													17,085
Co-borrower Obligation Under the Unsecured Revolving Credit Facility [Member]
Contractual interest (including default interest)	[1]												11,155
Debtor Reorganization Items, Provision for Expected Allowed Claims	[1]												11,155
Floating Rate Secured Term Loans due through 2023 [Member]
Contractual interest (including default interest)	[1]												20,460
Reorganization expense	[1]												10,083
Debtor Reorganization Items, Provision for Expected Allowed Claims	[1]												$ 30,543
Co Borrower [Member] | INSW Revolver Facility [Member] | The Pre-reorganized INSW Loan Facilities [Member]
Repayments of long-term lines of credit		$ 217,000
Co Borrower [Member] | Unsecured Revolving Credit Facility [Member] | The Pre-reorganized INSW Loan Facilities [Member]
Repayments of long-term lines of credit		217,000
OSG Inc. [Member]
Reorganization expense											$ 131	$ 5,659
Secured Term Loans [Member] | The Pre-reorganized INSW Loan Facilities [Member]
Repayments of secured debt		110,000
Secured Term Loans [Member] | OSG Inc. [Member] | The Pre-reorganized INSW Loan Facilities [Member]
Repayments of secured debt		$ 468,687
[1]	The Company repaid the principal outstanding of $217,000 for the co-borrower obligation under the unsecured revolving credit facility and the Company and OSG repaid principal outstanding amounts of $110,000 and $468,687, respectively, for the floating rate secured term loans (collectively, the pre-reorganized INSW loan facilities) on the Effective Date.

DEBT (Schedule of Interest Paid

DEBT (Schedule of Interest Paid) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OSG Inc. [Member]
Interest paid, net				$ 838
INSW Facilities [Member]
Interest paid, net	[1]	$ 33,039	$ 36,368	31,049
INSW Facilities, due 2019 [Member]
Interest paid, net		$ 33,039	$ 36,368	9,239
Co-borrower Obligation Under the Unsecured Revolving Credit Facility [Member]
Interest paid, net				11,496
Floating Rate Secured Term Loans due through 2023 [Member]
Interest paid, net	[2]			10,314
Rejected Charter Leases Obligations [Member]
Interest paid, net				7,453
Other Obligations [Member]
Interest paid, net				$ 117
[1]	For the year ended December 31, 2014, excludes contractual interest the Company paid of $7,453 and $117 relating to the rejected charters (See Note 16, "Leases") and other obligations, respectively.
[2]	Additionally, OSG paid approximately $838 of interest for the year ended December 31, 2014 relating to its guarantee of the floating rate secured loans, which was deemed a capital contribution for financial reporting purposes.

FAIR VALUE OF FINANCIAL INSTR77

FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES (Narrative) (Details) - Interest Rate Cap [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value Of Financial Instruments Derivatives And Fair Value Disclousres [Line Items]
Derivative, notional amount	$ 400,000	$ 400,000
Derivative, cap interest rate	2.50%	2.50%
Derivative, maturity date	Feb. 5, 2017

FAIR VALUE OF FINANCIAL INSTR78

FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES (Fair Value of Financial Instruments Other Than Derivatives) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 92,001	$ 317,847	[1]
Restricted cash - non current		8,989
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	92,001	317,847	[1]
Term Loan [Member] | INSW Facilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Payable, Fair Value Disclosure	(447,888)	(601,928)
Term Loan [Member] | INSW Facilities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Payable, Fair Value Disclosure	$ (447,888)	$ (601,928)
[1]	Includes non-current restricted cash aggregating $8,989 at December 31, 2015.

FAIR VALUE OF FINANCIAL INSTR79

FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES (Fair Value of Derivative Instruments) (Details) - Interest Rate Cap [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative Asset		$ 2
Derivative Liability
Other Assets [Member]
Derivative Instruments in Hedges, Assets, at Fair Value		2
Other Liabilities [Member]
Derivative Instruments in Hedges, Liabilities, at Fair Value

FAIR VALUE OF FINANCIAL INSTR80

FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES (Effect of Cash Flow Hedging Relationships) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unrealized losses on derivative instruments	$ (3,052)	$ (10,193)	$ (21,659)
Interest Rate Cap [Member]
Unrealized losses on derivative instruments	(2)	(472)	(172)
Interest Rate Swap [Member]
Unrealized losses on derivative instruments	$ (3,050)	$ (9,721)	$ (21,487)

FAIR VALUE OF FINANCIAL INSTR81

FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES (Effect of Cash Flow Hedging Relationships on Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Effective portion of gain/(loss) reclassified from accumulated other comprehensive loss		$ (2)
Ineffective Portion
Interest Rate Cap [Member] | Interest Expense [Member]
Effective portion of gain/(loss) reclassified from accumulated other comprehensive loss	(517)	(2)
Ineffective Portion

FAIR VALUE OF FINANCIAL INSTR82

FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES (Fair Values of Assets and Liabilities Measured on Recurring Basis) (Details) - Interest Rate Cap [Member] - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Derivative assets			$ 2
Fair Value, Inputs, Level 2 [Member]
Derivative assets	[1]		$ 2
[1]	For the interest rate cap, fair value is derived using valuation models that utilize the income valuation approach. These valuation models take into account contract terms such as maturity, as well as other inputs such as interest rate yield curves and creditworthiness of the counterparty and the Company.

FAIR VALUE OF FINANCIAL INSTR83

FAIR VALUE OF FINANCIAL INSTRUMENTS, DERIVATIVES AND FAIR VALUE DISCLOSURES (Fair Value of Items Measured on Nonrecurring Basis) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016
1 Vessel International Crude Tanker Segment and 7 Vessels International Product Carriers Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Impairment Charges		$ (29,602)
International Crude Tankers Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Fair Value	[1],[2]	38,828
Vessels held for use, Impairment Charges	[1],[2]	(7,786)
Other than temporary impairment - Equity method investment	[3]	258,061
Impairment of equity method investments	[3]	(30,475)
International Crude Tankers Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Fair Value	[1],[2]	28,875
International Crude Tankers Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Fair Value	[1],[2]	9,953
Other than temporary impairment - Equity method investment	[3]	258,061
International Product Carriers Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Fair Value	[1],[2]	89,557
Vessels held for use, Impairment Charges	[1],[2]	(71,456)
International Product Carriers Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Fair Value	[1],[2]	40,000
International Product Carriers Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Fair Value	[1],[2]	49,557
Two Vessels [Member] | International Crude and Product Carriers Segments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Impairment Charges		(49,640)
Four Vessels [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Fair Value			$ 68,875
Eight Vessels [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Vessels held for use, Fair Value		$ 59,510
[1]	Aggregate pre-tax impairment charges of $49,640 related to two vessels in each of the International Crude Tanker and International Product Carriers segments and $29,602 related to one vessel in the International Crude Tanker segment and seven vessels in the International Product Carriers segment were recorded during the three-month periods ended September 30, 2016 and December 31, 2016, respectively.
[2]	Fair value measurements aggregating $59,510 at December 31, 2016 used to determine the impairment for eight vessels were based on the income approach, which utilized cash flow projections consistent with the most recent projections of the Company and a discount rate equivalent to INSW's weighted average cost of capital. Because the Company uses its own cash flow projections, the cash flow projections are considered to be Level 3. The fair value measurements of $68,875 at September 30, 2016 used to determine impairment for four vessels were based upon a market approach, which considered the expected sales prices of vessels obtained from vessel appraisals. Because sales of vessels occur somewhat infrequently the expected sales prices are considered to be Level 2.
[3]	Aggregate pre-tax impairment charges of $30,475 related to the Company's investments in the FSO joint ventures, which are accounted for using the equity method, were recorded during the three-month period ended December 31, 2016. The fair value measurement of $258,061 at December 31, 2016 used to determine the amount of the impairment was based on the income approach, which utilized cash flow projections consistent with the most recent projections of the Company, and a discount rate equivalent to a market participant's weighted average cost of capital. Because the Company uses its own cash flow projections, the cash flow projections are considered to be Level 3.

ACCOUNTS PAYABLE, ACCRUED EXP84

ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Schedule of Accounts Payable, Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ACCOUNTS PAYABLE, ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES [Abstract]
Accounts payable	$ 2,866	$ 3,371
Payroll and benefits	5,672	2,154
Interest	4,042	5,636
Due to owners on chartered in vessels	856	2,141
Accrued drydock and repair costs	1,608	2,127
Bunkers and lubricants	2,787	820
Charter revenues received in advance	6,725	1,227
Insurance	2,650	1,517
Accrued vessel expenses	6,804	9,086
Accrued general and administrative expenses	2,644	1,107
Other	1,583	1,597
Total accounts payable, accrued expense and other current liabilities	$ 38,237	$ 30,783

TAXES (Narrative) (Details)

TAXES (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2015
Income Tax Contingency [Line Items]
Percent of shipping income subject to U.S. federal taxation	4.00%
Operating loss carryforwards	$ 42,001		$ 66,499
Indefinite-lived net operating loss carryforwards	4,558
Definite-lived net operating loss carryforwards	37,443
Operating loss carryforwards, valuation allowance	5,406		9,904
Increase (decrease) in valuation allowance	(4,498)
Unrecognized tax benefits, interest on income taxes accrued	33		$ 22
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities	$ 94
Minimum [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards, expiration date	Jan. 1, 2018
Maximum [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards, expiration date	Dec. 31, 2023
Secured Term Loans [Member] | OSG Inc. [Member]
Income Tax Contingency [Line Items]
Repayments of debt		$ 477,835

TAXES (Components of Income Tax

TAXES (Components of Income Tax (Provisions) and Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Taxes [Abstract]
Current									$ 440	$ 140	$ 754
Deferred											(10)
Total provision for income taxes	$ 283	$ (20)	$ 173	$ 4	$ 254	$ 27	$ 95	$ (236)	$ 440	$ 140	$ 744

TAXES (Reconcilation of Effecti

TAXES (Reconcilation of Effective to Statutory Tax Rate) (Details) - Foreign Operations [Member]	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Adjustments due to:
Liquidation of subsidiaries	(29.53%)
MARSHALL ISLANDS [Member]
Adjustments due to:
Change in valuation allowance	25.29%		0.04%
Income subject to tax in other jurisdictions	1.76%	0.08%	0.59%
Effective tax rate	(2.48%)	0.08%	0.63%

TAXES (Components of Deferred T

TAXES (Components of Deferred Tax Liabilities and Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating loss carryforwards	$ 1,711	$ 6,714
Excess of tax over book basis of depreciable assets	548	666
Pensions	3,147	2,519
Other		5
Total deferred tax assets	5,406	9,904
Less: Valuation allowance	(5,406)	(9,904)
Net deferred tax assets
Net noncurrent deferred tax assets

TAXES (Reconcilation of Amounts

TAXES (Reconcilation of Amounts of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Taxes [Abstract]
Balance of unrecognized tax benefits as of January 1,	$ 40	$ 170
Increases for positions taken in prior years	115
Decreases for positions taken in prior years		(130)
Changes due to currency translations	(2)
Balance of unrecognized tax benefits as of December 31,	$ 153	$ 40

RELATED PARTIES (Narrative) (De

RELATED PARTIES (Narrative) (Details) - USD ($)	Aug. 07, 2014	Aug. 05, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2017	Dec. 31, 2013	Nov. 14, 2012
Reorganization Items, net			$ 233,000	$ 3,849,000	$ 520,000	$ (4,471,000)	$ 1,151,000	$ 953,000	$ 1,187,000	$ 2,368,000	$ 131,000	$ 5,659,000	$ 104,528,000
Non-cash expense relating to stock compensation benefits											2,841,000	2,811,000	571,000
Net Carrying Value			1,100,050,000				1,240,411,000				1,100,050,000	1,240,411,000
Impairment of long-lived assets held-for-use											79,242,000
Noncash capital transaction													154,220,000
Capital contribution to former parent		$ 53,225,000
Reimbursed amount from related party	$ 6,306,000
Separation and transition costs											9,043,000
Severance costs related to separation and transition costs											3,337,000
Cash dividends paid to parent company by unconsolidated subsidiaries											$ 202,000,000	$ 200,000,000
Dividends paid, per share											$ 6.93	$ 6.86
Transition Services Agreement [Member]
Accounts receivable, related parties, current			27,000								$ 27,000
Accounts payable, related parties, current			31,000								31,000
Transition Services Agreement [Member] | Scenario, Forecast [Member]
Receivable from (payable to) related party														$ 79,000
Vessel/Fleet [Member]
Net Carrying Value			1,097,491,000				1,237,934,000				1,097,491,000	$ 1,237,934,000	1,306,540,000		$ 1,360,799,000
Product Carrier Victory Ship [Member]
Net Carrying Value																$ 24,687,000
Parent Company [Member] | Financial Guarantee [Member]
Repayments of debt		477,835,000
Parent Company [Member] | Transition Services Agreement [Member] | Scenario, Forecast [Member]
Receivable from (payable to) related party														$ (156,000)
Maremar Tanker Limitied Liability Company [Member] | Product Carrier Victory Ship [Member]
Non cash forgiveness of related party receivable applied to capital contributions													23,213,000
Impairment of long-lived assets held-for-use													124,000
OSG Inc. [Member]
Capital contribution from former parent											3,797,000	9,424,000
Reorganization Items, net											131,000	5,659,000
Non-cash expense relating to stock compensation benefits											2,520,000	2,811,000
Allocated general and administrative expenses recorded as capital contributions											1,146,000	954,000
Qatar Gas Transport Company Limited Nakilat Joint Venture [Member]
Guarantor obligation fee											100,000
Secured Term Loans [Member] | OSG Inc. [Member]
Repayments of debt													$ 477,835,000
The Pre-reorganized INSW Loan Facilities [Member] | INSW Revolver Facility [Member] | Co Borrower [Member]
Repayments of long-term lines of credit		217,000,000
The Pre-reorganized INSW Loan Facilities [Member] | Unsecured Revolving Credit Facility [Member] | Co Borrower [Member]
Repayments of long-term lines of credit		$ 217,000,000
Euronav Nv / FSO Joint Venture [Member] | FSO Asia and FSO Africa [Member]
Guarantor obligations, maximum exposure, undiscounted			38,789,000								38,789,000
Guarantor obligations, current carrying value			0				$ 0				0	$ 0
LNG Joint Venture [Member]
Annual fee to related party			$ 125,000								$ 125,000

RELATED PARTIES (Schedule of Re

RELATED PARTIES (Schedule of Related Party Transactions) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reorganization Items, net	$ 233	$ 3,849	$ 520	$ (4,471)	$ 1,151	$ 953	$ 1,187	$ 2,368	$ 131	$ 5,659	$ 104,528
Due to the Former Parent and its subsidiaries for cost sharing reimbursements	$ 683				$ 11,350				683	11,350
OSG Inc. [Member]
General and administrative									21,486	36,792	39,570
Depreciation									517	730	1,022
Technical management transition costs											21
Severance and relocation costs									6,569		670
Reorganization Items, net									131	5,659	86,179
Total corporate overhead allocations from the Former Parent									$ 28,703	$ 43,181	$ 127,462

CAPITAL STOCK AND STOCK COMPE92

CAPITAL STOCK AND STOCK COMPENSATION (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reorganization Items, net	$ 233	$ 3,849	$ 520	$ (4,471)	$ 1,151	$ 953	$ 1,187	$ 2,368	$ 131	$ 5,659	$ 104,528
Restricted stock or unit expense									$ 2,157	$ 2,380	$ 497
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term									8 years 9 months 4 days
Vested or expected to vest, shares	0				0				0	0	0
Stock options, compensation expense (income)									$ 684	$ 431	$ 56
Share based compensation expense, unrecognized	$ 2,645								$ 2,645
Share based compensation expense, unrecognized, period									1 year 5 months 16 days
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, options									127,559
Spin Off Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, shares authorized under stock option plans, exercise price range, outstanding options, weighted average exercise price	$ 23.61								$ 23.61
Spin Off Options [Member] | Exercise Prices Ranging from $19.04 to $30.94 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range, price									$ 19.04
Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Plan stock option compensation costs to be recognized over remaining vesting period	$ 427								$ 427
Management Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized, share plans	2,000,000								2,000,000
Management Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted									24,953
Management Plan [Member] | Time Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted									76,585
Granted, per share									$ 15
Management Plan [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted									33,709
Granted, per share									$ 15
Management Plan [Member] | Performance Shares [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage									33.3333%
Management Plan [Member] | Performance Shares [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage									33.3333%
Management Plan [Member] | Performance Shares [Member] | Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage									33.3333%
Management Plan [Member] | Convertible into Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted									8,756
Management Plan [Member] | Spin Off Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, method used									Black-Scholes option pricing model
Fair value assumptions, risk free interest rate									2.18%	1.79%	1.79%
Fair value assumptions, expected dividend rate									0.00%	0.00%	0.00%
Fair value assumptions, expected volatility factor									0.40%	0.40%	0.40%
Fair value assumptions, expected life									5 years	4 years	4 years
Options, weighted average grant-date fair value									$ 4.55	$ 2.26	$ 1.86
Vesting period									3 years
Awards, expiration									10 years
Management Plan [Member] | Spin Off Options [Member] | Exercise Prices Ranging from $19.04 to $30.94 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range, price									$ 19.04
Upper range, price									$ 30.93
Stock issued during period, shares, new issues									127,559
Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized, share plans	400,000								400,000
Director Plan [Member] | Restricted Stock [Member] | Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted									32,067
Director Plan [Member] | Common Class A [Member] | Restricted Stock [Member] | Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, per share									$ 13.72
Stock Incentive Plan 2004 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reorganization Items, net											$ 1,374
OSG Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reorganization Items, net									$ 131	$ 5,659

CAPITAL STOCK AND STOCK COMPE93

CAPITAL STOCK AND STOCK COMPENSATION (Restricted Stock Activity) (Details) - Restricted Common Stock and Restricted Stock Units [Member]	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
INSW RSUs issued to replace OSG RSUs	110,294
Granted	32,067
Vested	(25,103)
Nonvested Shares Outstanding Ending Balance	117,258
Vested, share price | $ / shares	$ 19.04

CAPITAL STOCK AND STOCK COMPE94

CAPITAL STOCK AND STOCK COMPENSATION (Stock Option Activity) (Details) - Employee Stock Option [Member] - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding Beginning Balance
Granted	127,559
Forfeited
Exercised
Canelled		(127,559)
Options Outstanding Ending Balance	127,559
Options Exercisable		26,601

ACCUMULATED OTHER COMPREHENSI95

ACCUMULATED OTHER COMPREHENSIVE LOSS (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Accumulated Other Comprehensive Loss [Abstract]
Unrecognized prior service credits	$ 1,403
Unrecognized prior service credits, net of tax	1,068
Unrecognized actuarial losses	12,173
Unrecognized actuarial losses, net of tax	10,882
Prior service credit expected to be recognized, next fiscal year	64
Actuarial losses expected to be recognized, next fiscal year	421
Derivative instruments, gain (loss) reclassification from accumulated oci to income, estimated net amount to be transferred	$ 12,499

ACCUMULATED OTHER COMPREHENSI96

ACCUMULATED OTHER COMPREHENSIVE LOSS (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Loss [Abstract]
Unrealized losses on derivative instruments	$ (40,317)	$ (53,446)	$ (61,356)	$ (59,263)
Items not yet recognized as a component of net periodic benefit cost (pension plans)	(11,950)	(10,636)	(12,988)	(8,246)
Foreign currency translation adjustment		(42)	(29)	(116)
Accumulated other comprehensive loss	$ (52,267)	$ (64,124)	$ (74,373)	$ (67,625)

ACCUMULATED OTHER COMPREHENSI97

ACCUMULATED OTHER COMPREHENSIVE LOSS (Changes in Components of AOCI, Net of Related Taxes) (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2014	Jul. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Loss [Abstract]
Unrealized losses on cash flow hedges, Beginning Balance		$ (59,263)	$ (53,446)	$ (61,356)	$ (59,263)
Unrealized losses on cash flow hedges, Current period change excluding amounts reclassified from other comprehensive loss			(3,052)	(10,193)	(21,659)
Unrealized losses on cash flow hedges, Amounts reclassified from accumulated other comprehensive loss			16,181	18,103	19,566
Unrealized losses on cash flow hedges, Total change in accumulated other comprehensive loss			13,129	7,910	(2,093)
Unrealized losses on cash flow hedges, Ending Balance	$ (61,356)		(40,317)	(53,446)	(61,356)
Items not yet recognized as a component of net periodic benefit cost (pension and other postretirement plans), Beginning Balance		(8,246)	(10,636)	(12,988)	(8,246)
Items not yet recognized as a component of net periodic benefit cost (pension and other postretirement plans), Current period change excluding amounts reclassified from other comprehensive loss			(2,364)	1,870	(5,069)
Items not yet recognized as a component of net periodic benefit cost (pension and other postretirement plans), Amounts reclassified from accumulated other comprehensive loss			1,050	482	327
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Total			(1,314)	2,352	(4,742)
Items not yet recognized as a component of net periodic benefit cost (pension and other postretirement plans), Ending Balance	(12,988)		(11,950)	(10,636)	(12,988)
Foreign currency translation adjustment, Beginning Balance		(116)	(42)	(29)	(116)
Foreign currency translation adjustment, Current period change, excluding amounts reclassified from accumulated other comprehensive loss			42	(13)	87
Foreign currency translation adjustment, Total change in accumulated other comprehensive loss			42	(13)	87
Foreign currency translation adjustment, Ending Balance	(29)			(42)	(29)
Beginning Balance		(67,625)	(64,124)	(74,373)	(67,625)
Current period change excluding amounts reclassified from other comprehensive loss			(5,374)	(8,336)	(26,641)
Amounts reclassified from accumulated other comprehensive loss			17,231	18,585	19,893
Total change in accumulated other comprehensive loss	(5,764)	$ (984)	11,857	10,249	(6,748)
Ending Balance	$ (74,373)		$ (52,267)	$ (64,124)	$ (74,373)

ACCUMULATED OTHER COMPREHENSI98

ACCUMULATED OTHER COMPREHENSIVE LOSS (Amounts Reclassified out of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Items not yet recognized as a component of net periodic benefit cost (pension and other postretirement plans):
Other comprehensive income (loss), before tax	$ (17,231)	$ (18,585)	$ (19,901)
Other comprehensive income (loss), tax expense (benefit)			8
Total reclassification from AOCI	(17,231)	(18,585)	(19,893)
Equity in Income of Affiliated Companies [Member] | Interest Rate Swap [Member]
Unrealized losses on cash flow hedges:
Unrealized gain (loss) on cash flow hedge instruments	(15,664)	(18,101)	(19,566)
Interest Expense [Member] | Interest Rate Cap [Member]
Unrealized losses on cash flow hedges:
Unrealized gain (loss) on cash flow hedge instruments	(517)	(2)
General and Administrative Expense [Member]
Items not yet recognized as a component of net periodic benefit cost (pension and other postretirement plans):
Net periodic benefit costs associated with pension and postretirement benefit plans for shore-based employees	$ (1,050)	$ (482)	$ (335)

ACCUMULATED OTHER COMPREHENSI99

ACCUMULATED OTHER COMPREHENSIVE LOSS (Income Tax Expense Allocated to Each Component of Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Items not yet recognized as a component of net periodic benefit cost (pension and other postretirement plans), Current period change excluding amounts reclassified from other comprehensive loss	$ (2,364)	$ 1,870	$ (5,069)
Items not yet recognized as a component of net periodic benefit cost (pension and other postretirement plans), Amounts reclassified from accumulated other comprehensive loss	1,050	482	327
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Total	$ (1,314)	$ 2,352	(4,742)
Tax (Expense)/ Benefit [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Items not yet recognized as a component of net periodic benefit cost (pension and other postretirement plans), Amounts reclassified from accumulated other comprehensive loss			8
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Total			$ 8

LEASES (Narrative) (Details)

LEASES (Narrative) (Details) $ in Thousands	Aug. 05, 2014USD ($)	Dec. 31, 2012property	Dec. 31, 2016USD ($)property	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Apr. 30, 2013property	Apr. 30, 2013property	Dec. 31, 2016USD ($)property	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Leases [Line Items]
Reorganization items, total | $			$ 233	$ 3,849	$ 520	$ (4,471)	$ 1,151	$ 953	$ 1,187	$ 2,368			$ 131	$ 5,659	$ 104,528
Interest expense | $			$ 9,525	$ 9,519	$ 9,690	$ 10,742	$ 10,934	$ 11,050	$ 10,566	$ 10,420			39,476	42,970	56,258
Operating leases, rent expense | $													$ 37,411	$ 36,802	$ 60,955
Contract Termination [Member]
Leases [Line Items]
Interest expense | $	$ 7,453
Stock Compensation Plan [Member]
Leases [Line Items]
Reorganization items, total | $	$ 6,419
7 Handysize Product Carriers and 1 Aframax [Member]
Leases [Line Items]
Number of vessels, new lease agreements													8
Suezmax [Member]
Leases [Line Items]
Number of vessels, redelivered to owners		1
Handysize Product Carrier [Member]
Leases [Line Items]
Number of vessels, redelivered to owners		1
11 Handysize Product Carriers, 2 Panamax Product Carriers, 1 Suezmax and 1 Aframax [Member]
Leases [Line Items]
Number of vessels, redelivered to owners											15
Charter-In [Member]
Leases [Line Items]
Number of vessels, rejected leases, Court approved												25
Commitments to charter in vessels, Number of Units			7										7
Bareboat Charters-In [Member]
Leases [Line Items]
Commitments to charter in vessels, Number of Units			3										3
Time Charters-In [Member]
Leases [Line Items]
Commitments to charter in vessels, Number of Units			4										4

LEASES (Bareboat and Time Chart

LEASES (Bareboat and Time Charters-In) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Bareboat Charters-In [Member]
Leases [Line Items]
2,017	$ 7,016
2,018	1,841
Net minimum lease payments	$ 8,857
2017, operating days	1063 days
2018, operating days	279 days
Operating days, total	1342 days
Time Charters-In [Member]
Leases [Line Items]
2,017	$ 15,440
Net minimum lease payments	$ 15,440
2017, operating days	1488 days
Operating days, total	1488 days

LEASES (Future Minimum Revenues

LEASES (Future Minimum Revenues on Charters-Out) (Details) - Charters-Out [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract]
2,017	$ 30,718
2,018	913
Net minimum lease payments	$ 31,631
2017, revenue days	1504 days
2018, revenue days	166 days
Revenue Days	1670 days

LEASES (Future Minimum Lease Ob

LEASES (Future Minimum Lease Obligations for Office Space) (Details) - Office Space [Member] $ in Thousands	Dec. 31, 2016USD ($)
Leases [Line Items]
2,017	$ 1,088
2,018	998
2,019	998
2,020	998
2,021	665
Net minimum lease payments	$ 4,747

PENSION AND OTHER POSTRETIRE104

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Narrative) (Details) - Scheme Plan [Member] - Foreign Pension Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, contributions by employer		$ 7,605	$ 1,161	$ 4,519
Scenario, Forecast [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, contributions by employer	$ 719
Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, target plan asset allocations		86.00%	90.00%
Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, target plan asset allocations		10.00%	14.00%

PENSION AND OTHER POSTRETIRE105

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in benefit obligation:
Cost of benefits earned (service cost)			$ 532
Interest cost on benefit obligation	$ 886	$ 1,164	1,333
Change in plan assets:
Fair value of plan assets at beginning of year
Fair value of plan assets at year end	25,466
Scheme Plan [Member] | Foreign Pension Plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	29,899	34,138
Interest cost on benefit obligation	932	1,164
Actuarial (gains)/losses	5,525	(2,387)
Benefits paid	(603)	(1,501)
Settlements	(1,579)
Foreign exchange losses/(gains)	(4,934)	(1,515)
Benefit obligation at year end	29,240	29,899	34,138
Change in plan assets:
Fair value of plan assets at beginning of year	21,090	22,205
Actual return on plan assets	2,503	175
Employer contributions	7,605	1,161	4,519
Benefits paid	(603)	(1,501)
Settlements	(1,775)
Foreign exchange losses	(3,354)	(950)
Fair value of plan assets at year end	25,466	21,090	$ 22,205
Unfunded status at December 31	$ (3,774)	$ (8,809)

PENSION AND OTHER POSTRETIRE106

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Domestic Plans with Accumulated Benefit Obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Pension and Other Postretirement Benefit Plans [Abstract]
Projected benefit obligation	$ 29,240	$ 29,899
Accumulated benefit obligation	29,240	29,899
Fair value of plan assets	$ 25,466	$ 21,090

PENSION AND OTHER POSTRETIRE107

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Components of Expense, Domestic Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of expense:
Defined benefit plan, service cost			$ 532
Defined benefit plan, interest cost	$ 886	$ 1,164	1,333
Expected return on plan assets	(951)	(1,159)	(1,573)
Amortization of prior-service costs	67	79	87
Recognized net actuarial loss	343	403	230
Recognized settlement loss	640
Net periodic (benefit)/cost	$ 985	$ 487	$ 609

PENSION AND OTHER POSTRETIRE108

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Weighted-Average Assumptions Used to Determine Benefit Obligations) (Details)	Dec. 31, 2016	Dec. 31, 2015
Pension and Other Postretirement Benefit Plans [Abstract]
Discount rate	2.60%	3.80%

PENSION AND OTHER POSTRETIRE109

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Assumptions Used to Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension and Other Postretirement Benefit Plans [Abstract]
Discount rate	3.80%	3.55%	4.50%
Expected (long-term) return on plan assets	5.62%	5.35%	7.29%
Rate of future compensation increases

PENSION AND OTHER POSTRETIRE110

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Expected Benefit Payments) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Pension and Other Postretirement Benefit Plans [Abstract]
2,017	$ 1,015
2,018	773
2,019	785
2,020	798
2,021	1,025
Years 2022-2026	5,926
Defined Benefit Plan Expected Future Benefit Payments	$ 10,322

PENSION AND OTHER POSTRETIRE111

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Fair Values of Pension Plan Assets) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	$ 25,466
Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	8,303
International Companies [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	15,166
Government Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	1,997
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	8,303
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	8,303
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	17,163	[1]
Fair Value, Inputs, Level 2 [Member] | International Companies [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	15,166	[1]
Fair Value, Inputs, Level 2 [Member] | Government Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, fair value of plan assets	$ 1,997	[1]
[1]	Quoted prices for the equity and debt securities are not available from an active market source since such investments are index funds. Therefore, the mid-price, which is a price calculated based on the mid-point between the buying and the selling prices of the index funds assets, was used as such mid-prices are considered to be quoted prices for similar assets.

SEVERANCE COSTS (Narrative) (De

SEVERANCE COSTS (Narrative) (Details) $ in Thousands	Jan. 14, 2014property	Jan. 12, 2014property	Dec. 31, 2016USD ($)item	Dec. 31, 2015USD ($)item	Dec. 31, 2014USD ($)
Restructuring Cost and Reserve [Line Items]
Number of owned vessels | property	46	33
Severance costs					$ 16,666
Transition costs				$ 39	3,417
International Crude Tankers Segment [Member]
Restructuring Cost and Reserve [Line Items]
Number of owned vessels | item			24	24
Severance costs					3,428
Transition costs					1,672
International Product Carriers Segment [Member]
Restructuring Cost and Reserve [Line Items]
Number of owned vessels | item			18	18
Severance costs			$ 0	$ 0	7,651
Transition costs					1,260
Non Executive Employees Incentive Program [Member]
Restructuring Cost and Reserve [Line Items]
Target awards, amount					$ 3,228
Non Executive Employees Incentive Program [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Percentage of target awards					25.00%
Non Executive Employees Incentive Program [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Percentage of target awards					75.00%

2016 AND 2015 QUARTERLY RESULTS

2016 AND 2015 QUARTERLY RESULTS OF OPERATIONS (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jul. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information [Line Items]
Shipping revenues	$ 85,810		$ 80,771		$ 103,062		$ 128,676		$ 124,970	$ 131,121	$ 124,093	$ 117,450			$ 398,319	$ 497,634	$ 517,018
Gain/(loss) on disposal of vessels, including impairments	(29,734)		(49,640)				171		55	3,238		1,166			(79,203)	4,459	9,955
Income/(loss) from vessel operations	(28,509)		(47,758)		29,079		53,129		39,611	52,982	47,676	36,045			5,941	176,314	4,604
Interest expense	(9,525)		(9,519)		(9,690)		(10,742)		(10,934)	(11,050)	(10,566)	(10,420)			(39,476)	(42,970)	(56,258)
Reorganization items, net	(233)		(3,849)		(520)		4,471		(1,151)	(953)	(1,187)	(2,368)			(131)	(5,659)	(104,528)
Income Tax Provision	(283)		20		(173)		(4)		(254)	(27)	(95)	236			(440)	(140)	(744)
Net (loss)/income	$ (57,757)	[1]	$ (50,862)	[1]	$ 30,506	[1]	$ 59,890	[1]	$ 37,606	$ 51,933	$ 47,690	$ 35,941	$ 888	$ (119,987)	$ (18,223)	$ 173,170	$ (119,099)
Basic and Diluted net income (in dollars per share)	$ (1.98)		$ (1.74)		$ 1.05		$ 2.05		$ 1.29	$ 1.78	$ 1.64	$ 1.23			$ (0.62)	$ 5.94	$ (4.08)
Euronav NV FSO Joint Venture And LNG Joint Venture And Other Equity Method Invesments [Member]
Quarterly Financial Information [Line Items]
Other than temporary impairment - Equity method investment, Impairment Charges															$ 30,475
Euronav Nv / FSO Joint Venture [Member]
Quarterly Financial Information [Line Items]
Other than temporary impairment - Equity method investment, Impairment Charges															$ 30,475
[1]	As discussed in Note 7, "Equity Method Investments," the Company recorded impairment charges of $30,475 in the fourth quarter related to its investment in the FSO Joint Venture.

CONTINGENCIES (Narrative) (Deta

CONTINGENCIES (Narrative) (Details) £ in Thousands, $ in Thousands	1 Months Ended			12 Months Ended
	Oct. 31, 2015GBP (£)	Oct. 31, 2015USD ($)	Jun. 30, 2015USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Loss Contingencies [Line Items]
Expected special cash dividends				$ 202,000	$ 200,000
Merchant Navy Ratings Pension Fund [Member]
Loss Contingencies [Line Items]
Defined benefit plan, contributions by employer	£ 700	$ 1,074	$ 1,487

Uncategorized Items - cik000167

Label	Element	Value
Lng Joint Venture [Member] | Liquid Natural Gas Carrier Vessel [Member]
Equity Method Investment Summarized Financial Information Accounts Payable And Accrued Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationAccountsPayableAndAccruedExpenses	$ 7,634,000
Equity Method Investment Summarized Financial Information Accounts Payable And Accrued Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationAccountsPayableAndAccruedExpenses	6,103,000
Equity Method Investment Summarized Financial Information Trade Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesCurrent	655,000
Equity Method Investment Summarized Financial Information Trade Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesCurrent	853,000
Equity Method Investment, Summarized Financial Information, Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets	868,395,000
Equity Method Investment, Summarized Financial Information, Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets	852,027,000
Equity Method Investment Summarized Financial Information Long Term Debt Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationLongTermDebtNoncurrent	631,655,000
Equity Method Investment Summarized Financial Information Long Term Debt Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationLongTermDebtNoncurrent	590,985,000
Equity Method Investment, Summarized Financial Information, Current Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	30,407,000
Equity Method Investment, Summarized Financial Information, Current Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	42,428,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	14,935,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	23,245,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	23,401,000
Equity Method Investment Summarized Financial Information Operating Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	56,463,000
Equity Method Investment Summarized Financial Information Operating Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	60,584,000
Equity Method Investment Summarized Financial Information Operating Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	60,352,000
Equity Method Investment, Summarized Financial Information, Revenue	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	112,300,000
Equity Method Investment, Summarized Financial Information, Revenue	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	114,819,000
Equity Method Investment, Summarized Financial Information, Revenue	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	116,547,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	868,395,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	852,027,000
Equity Method Investment Summarized Financial Information Cash And Cash Equivalents	insw_EquityMethodInvestmentSummarizedFinancialInformationCashAndCashEquivalents	14,031,000
Equity Method Investment Summarized Financial Information Cash And Cash Equivalents	insw_EquityMethodInvestmentSummarizedFinancialInformationCashAndCashEquivalents	25,844,000
Equity Method Investment Summarized Financial Information Assets Property Plant And Equipment Net	insw_EquityMethodInvestmentSummarizedFinancialInformationAssetsPropertyPlantAndEquipmentNet	785,523,000
Equity Method Investment Summarized Financial Information Assets Property Plant And Equipment Net	insw_EquityMethodInvestmentSummarizedFinancialInformationAssetsPropertyPlantAndEquipmentNet	759,127,000
Equity Method Investment, Summarized Financial Information, Current Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	73,246,000
Equity Method Investment, Summarized Financial Information, Current Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	70,347,000
Equity Method Investment Summarized Financial Information Other Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherReceivablesCurrent	203,000
Equity Method Investment Summarized Financial Information Other Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherReceivablesCurrent	54,000
Equity Method Investment Summarized Financial Information Operating Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses	55,837,000
Equity Method Investment Summarized Financial Information Operating Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses	54,235,000
Equity Method Investment Summarized Financial Information Operating Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses	56,195,000
Equity Method Investment Summarized Financial Information, Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity	86,539,000
Equity Method Investment Summarized Financial Information, Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity	132,783,000
Equity Method Investment Summarized Financial Information Derivative Liability Current	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityCurrent	26,307,000
Equity Method Investment Summarized Financial Information Derivative Liability Current	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityCurrent	22,545,000
Equity Method Investment Summarized Financial Information Assets Other Assets	insw_EquityMethodInvestmentSummarizedFinancialInformationAssetsOtherAssets	6,266,000
Equity Method Investment Summarized Financial Information Assets Other Assets	insw_EquityMethodInvestmentSummarizedFinancialInformationAssetsOtherAssets	2,593,000
Equity Method Investment Summarized Financial Information Restricted Cash Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationRestrictedCashNoncurrent	46,199,000
Equity Method Investment Summarized Financial Information Restricted Cash Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationRestrictedCashNoncurrent	47,879,000
Equity Method Investment Summarized Financial Information Derivative Liability Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityNoncurrent	76,955,000
Equity Method Investment Summarized Financial Information Derivative Liability Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityNoncurrent	57,912,000
Equity Method Investment Summarized Financial Information Restricted Cash Current	insw_EquityMethodInvestmentSummarizedFinancialInformationRestrictedCashCurrent	13,370,000
Equity Method Investment Summarized Financial Information Restricted Cash Current	insw_EquityMethodInvestmentSummarizedFinancialInformationRestrictedCashCurrent	13,160,000
Equity Method Investment Summarized Financial Information Long Term Debt Current	insw_EquityMethodInvestmentSummarizedFinancialInformationLongTermDebtCurrent	39,305,000
Equity Method Investment Summarized Financial Information Long Term Debt Current	insw_EquityMethodInvestmentSummarizedFinancialInformationLongTermDebtCurrent	41,699,000
Equity Method Investment Summarized Financial Information Inventory	insw_EquityMethodInvestmentSummarizedFinancialInformationInventory	2,148,000
Equity Method Investment Summarized Financial Information Inventory	insw_EquityMethodInvestmentSummarizedFinancialInformationInventory	2,517,000
Equity Method Investment Summarized Financial Information Interest Expense	insw_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	41,622,000
Equity Method Investment Summarized Financial Information Interest Expense	insw_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	39,650,000
Equity Method Investment Summarized Financial Information Interest Expense	insw_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	37,660,000
Equity Method Investment, Summarized Financial Information, Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities	781,856,000
Equity Method Investment, Summarized Financial Information, Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities	719,244,000
Equity Method Investment Summarized Financial Information Other Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss	94,000
Equity Method Investment Summarized Financial Information Other Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss	2,311,000
Equity Method Investment Summarized Financial Information Other Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss	709,000
Euronav Nv Joint Venture [Member] | Floating Storage Off Loading Unit Asia [Member]
Equity Method Investment Summarized Financial Information Accounts Payable And Accrued Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationAccountsPayableAndAccruedExpenses	1,731,000
Equity Method Investment Summarized Financial Information Accounts Payable And Accrued Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationAccountsPayableAndAccruedExpenses	1,557,000
Equity Method Investment Summarized Financial Information Trade Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesCurrent	10,817,000
Equity Method Investment Summarized Financial Information Trade Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesCurrent	10,891,000
Equity Method Investment Summarized Financial Information Due to Related Parties	insw_EquityMethodInvestmentSummarizedFinancialInformationDueToRelatedParties	247,000
Equity Method Investment, Summarized Financial Information, Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets	378,314,000
Equity Method Investment, Summarized Financial Information, Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets	367,534,000
Equity Method Investment Summarized Financial Information Long Term Debt Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationLongTermDebtNoncurrent	75,208,000
Equity Method Investment, Summarized Financial Information, Current Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	41,748,000
Equity Method Investment, Summarized Financial Information, Current Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	47,889,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	26,547,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	29,320,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	31,257,000
Equity Method Investment Summarized Financial Information Operating Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	34,158,000
Equity Method Investment Summarized Financial Information Operating Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	35,630,000
Equity Method Investment Summarized Financial Information Operating Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	36,099,000
Equity Method Investment, Summarized Financial Information, Revenue	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	64,330,000
Equity Method Investment, Summarized Financial Information, Revenue	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	65,097,000
Equity Method Investment, Summarized Financial Information, Revenue	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	65,389,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	378,314,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	367,534,000
Equity Method Investment Summarized Financial Information Cash And Cash Equivalents	insw_EquityMethodInvestmentSummarizedFinancialInformationCashAndCashEquivalents	16,413,000
Equity Method Investment Summarized Financial Information Cash And Cash Equivalents	insw_EquityMethodInvestmentSummarizedFinancialInformationCashAndCashEquivalents	23,013,000
Equity Method Investment Summarized Financial Information Assets Property Plant And Equipment Net	insw_EquityMethodInvestmentSummarizedFinancialInformationAssetsPropertyPlantAndEquipmentNet	328,719,000
Equity Method Investment Summarized Financial Information Assets Property Plant And Equipment Net	insw_EquityMethodInvestmentSummarizedFinancialInformationAssetsPropertyPlantAndEquipmentNet	309,821,000
Equity Method Investment, Summarized Financial Information, Current Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	33,150,000
Equity Method Investment, Summarized Financial Information, Current Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	77,734,000
Equity Method Investment Summarized Financial Information Other Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherReceivablesCurrent	466,000
Equity Method Investment Summarized Financial Information Other Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherReceivablesCurrent	407,000
Equity Method Investment Summarized Financial Information Operating Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses	30,172,000
Equity Method Investment Summarized Financial Information Operating Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses	29,467,000
Equity Method Investment Summarized Financial Information Operating Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses	29,290,000
Equity Method Investment Summarized Financial Information, Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity	124,301,000
Equity Method Investment Summarized Financial Information, Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity	158,006,000
Equity Method Investment Summarized Financial Information Derivative Liability Current	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityCurrent	2,556,000
Equity Method Investment Summarized Financial Information Derivative Liability Current	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityCurrent	969,000
Loan from Shareholders	insw_LoanFromShareholders	144,794,000	[1]
Loan from Shareholders	insw_LoanFromShareholders	131,794,000	[1]
Equity Method Investment Summarized Financial Information Trade Receivables Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesNoncurrent	7,847,000
Equity Method Investment Summarized Financial Information Trade Receivables Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesNoncurrent	9,824,000
Equity Method Investment Summarized Financial Information Derivative Liability Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityNoncurrent	861,000
Equity Method Investment Summarized Financial Information Restricted Cash Current	insw_EquityMethodInvestmentSummarizedFinancialInformationRestrictedCashCurrent	14,052,000
Equity Method Investment Summarized Financial Information Restricted Cash Current	insw_EquityMethodInvestmentSummarizedFinancialInformationRestrictedCashCurrent	13,578,000
Equity Method Investment Summarized Financial Information Long Term Debt Current	insw_EquityMethodInvestmentSummarizedFinancialInformationLongTermDebtCurrent	28,616,000
Equity Method Investment Summarized Financial Information Long Term Debt Current	insw_EquityMethodInvestmentSummarizedFinancialInformationLongTermDebtCurrent	75,208,000
Equity Method Investment Summarized Financial Information Interest Expense	insw_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	7,699,000
Equity Method Investment Summarized Financial Information Interest Expense	insw_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	6,348,000
Equity Method Investment Summarized Financial Information Interest Expense	insw_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	4,948,000
Equity Method Investment, Summarized Financial Information, Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities	254,013,000
Equity Method Investment, Summarized Financial Information, Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities	209,528,000
Equity Method Investment Summarized Financial Information Other Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss	88,000
Equity Method Investment Summarized Financial Information Other Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss	38,000
Equity Method Investment Summarized Financial Information Other Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss	106,000
Euronav Nv Joint Venture [Member] | Floating Storage Offloading Unit Africa [Member]
Equity Method Investment Summarized Financial Information Accounts Payable And Accrued Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationAccountsPayableAndAccruedExpenses	797,000
Equity Method Investment Summarized Financial Information Accounts Payable And Accrued Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationAccountsPayableAndAccruedExpenses	804,000
Equity Method Investment Summarized Financial Information Trade Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesCurrent	10,881,000
Equity Method Investment Summarized Financial Information Trade Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesCurrent	10,955,000
Equity Method Investment Summarized Financial Information Due to Related Parties	insw_EquityMethodInvestmentSummarizedFinancialInformationDueToRelatedParties	366,000
Equity Method Investment, Summarized Financial Information, Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets	353,294,000
Equity Method Investment, Summarized Financial Information, Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets	362,514,000
Equity Method Investment, Summarized Financial Information, Current Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	12,152,000
Equity Method Investment, Summarized Financial Information, Current Assets	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	38,214,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	30,457,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	34,379,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	36,098,000
Equity Method Investment Summarized Financial Information Operating Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	32,453,000
Equity Method Investment Summarized Financial Information Operating Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	35,591,000
Equity Method Investment Summarized Financial Information Operating Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	36,486,000
Equity Method Investment, Summarized Financial Information, Revenue	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	64,611,000
Equity Method Investment, Summarized Financial Information, Revenue	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	65,528,000
Equity Method Investment, Summarized Financial Information, Revenue	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue	65,515,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	353,294,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	362,514,000
Equity Method Investment Summarized Financial Information Cash And Cash Equivalents	insw_EquityMethodInvestmentSummarizedFinancialInformationCashAndCashEquivalents	880,000
Equity Method Investment Summarized Financial Information Cash And Cash Equivalents	insw_EquityMethodInvestmentSummarizedFinancialInformationCashAndCashEquivalents	26,928,000
Equity Method Investment Summarized Financial Information Assets Property Plant And Equipment Net	insw_EquityMethodInvestmentSummarizedFinancialInformationAssetsPropertyPlantAndEquipmentNet	334,247,000
Equity Method Investment Summarized Financial Information Assets Property Plant And Equipment Net	insw_EquityMethodInvestmentSummarizedFinancialInformationAssetsPropertyPlantAndEquipmentNet	315,295,000
Equity Method Investment, Summarized Financial Information, Current Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	3,704,000
Equity Method Investment, Summarized Financial Information, Current Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	2,072,000
Equity Method Investment Summarized Financial Information Other Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherReceivablesCurrent	391,000
Equity Method Investment Summarized Financial Information Other Receivables Current	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherReceivablesCurrent	331,000
Equity Method Investment Summarized Financial Information Operating Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses	32,158,000
Equity Method Investment Summarized Financial Information Operating Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses	29,937,000
Equity Method Investment Summarized Financial Information Operating Expenses	insw_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses	29,029,000
Equity Method Investment Summarized Financial Information, Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity	49,113,000
Equity Method Investment Summarized Financial Information, Equity	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity	85,211,000
Equity Method Investment Summarized Financial Information Derivative Liability Current	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityCurrent	2,541,000
Equity Method Investment Summarized Financial Information Derivative Liability Current	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityCurrent	1,268,000
Loan from Shareholders	insw_LoanFromShareholders	299,231,000	[1]
Loan from Shareholders	insw_LoanFromShareholders	275,231,000	[1]
Equity Method Investment Summarized Financial Information Trade Receivables Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesNoncurrent	6,895,000
Equity Method Investment Summarized Financial Information Trade Receivables Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationTradeReceivablesNoncurrent	9,005,000
Equity Method Investment Summarized Financial Information Derivative Liability Noncurrent	insw_EquityMethodInvestmentSummarizedFinancialInformationDerivativeLiabilityNoncurrent	1,246,000
Equity Method Investment Summarized Financial Information Interest Expense	insw_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	2,019,000
Equity Method Investment Summarized Financial Information Interest Expense	insw_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	1,221,000
Equity Method Investment Summarized Financial Information Interest Expense	insw_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense	403,000
Equity Method Investment, Summarized Financial Information, Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities	304,181,000
Equity Method Investment, Summarized Financial Information, Liabilities	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities	277,303,000
Equity Method Investment Summarized Financial Information Other Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss	23,000
Equity Method Investment Summarized Financial Information Other Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss	9,000
Equity Method Investment Summarized Financial Information Other Income Loss	insw_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeLoss	15,000
Lng Joint Venture [Member] | Lng Joint Venture [Member] | Liquid Natural Gas Carrier Vessel [Member]
Noncontrolling Interest in Joint Ventures	us-gaap_MinorityInterestInJointVentures	43,183,000
Noncontrolling Interest in Joint Ventures	us-gaap_MinorityInterestInJointVentures	$ 66,259,000
Equity method investment, ownership percentage	us-gaap_EquityMethodInvestmentOwnershipPercentage	49.90%
Equity method investment, ownership percentage	us-gaap_EquityMethodInvestmentOwnershipPercentage	49.90%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	$ 54,259,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	76,915,000
Equity Method Investments Other Investments In From Affiliated Companies	insw_EquityMethodInvestmentsOtherInvestmentsInFromAffiliatedCompanies	(36,000)
Equity Method Investments Other Investments In From Affiliated Companies	insw_EquityMethodInvestmentsOtherInvestmentsInFromAffiliatedCompanies	(37,000)
Equity Method Investment Unamortized Interest Cost	insw_EquityMethodInvestmentUnamortizedInterestCost	11,112,000
Equity Method Investment Unamortized Interest Cost	insw_EquityMethodInvestmentUnamortizedInterestCost	10,693,000
Euronav Nv Joint Venture [Member] | Euronav Nv Joint Venture [Member] | Floating Storage Off Loading Unit Asia [Member]
Unamortized Deferred Gain Of Investment	insw_UnamortizedDeferredGainOfInvestment	19,292,000
Unamortized Deferred Gain Of Investment	insw_UnamortizedDeferredGainOfInvestment	18,089,000
Equity Method Investment, Other than Temporary Impairment	us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment	15,977,000
Noncontrolling Interest in Joint Ventures	us-gaap_MinorityInterestInJointVentures	62,151,000
Noncontrolling Interest in Joint Ventures	us-gaap_MinorityInterestInJointVentures	79,003,000
Equity Method Investments Loan Income From Shareholders	insw_EquityMethodInvestmentsLoanIncomeFromShareholders	72,397,000
Equity Method Investments Loan Income From Shareholders	insw_EquityMethodInvestmentsLoanIncomeFromShareholders	$ 65,897,000
Equity method investment, ownership percentage	us-gaap_EquityMethodInvestmentOwnershipPercentage	50.00%
Equity method investment, ownership percentage	us-gaap_EquityMethodInvestmentOwnershipPercentage	50.00%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	$ 115,256,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	110,834,000
Euronav Nv Joint Venture [Member] | Euronav Nv Joint Venture [Member] | Floating Storage Offloading Unit Africa [Member]
Unamortized Deferred Gain Of Investment	insw_UnamortizedDeferredGainOfInvestment	19,703,000
Unamortized Deferred Gain Of Investment	insw_UnamortizedDeferredGainOfInvestment	18,496,000
Equity Method Investment, Other than Temporary Impairment	us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment	14,498,000
Noncontrolling Interest in Joint Ventures	us-gaap_MinorityInterestInJointVentures	24,557,000
Noncontrolling Interest in Joint Ventures	us-gaap_MinorityInterestInJointVentures	42,606,000
Equity Method Investments Loan Income From Shareholders	insw_EquityMethodInvestmentsLoanIncomeFromShareholders	149,616,000
Equity Method Investments Loan Income From Shareholders	insw_EquityMethodInvestmentsLoanIncomeFromShareholders	$ 137,616,000
Equity method investment, ownership percentage	us-gaap_EquityMethodInvestmentOwnershipPercentage	50.00%
Equity method investment, ownership percentage	us-gaap_EquityMethodInvestmentOwnershipPercentage	50.00%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	$ 154,470,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	$ 147,228,000
[1]	Such advances are unsecured, interest free and not repayable within one year.