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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2025
USD ($)
Percentile
$ / shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Pay vs Performance Disclosure          
Pay vs Performance Disclosure, Table
Pay vs. Performance
The following table provides information in understanding NEO compensation and Company performance as required by Section 953(a) of the Dodd-Frank Act, and Item 402(v) of Regulation S-K.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year
 
 
Summary
Compensation
Table Total for
PEO(1)
 
 
Compensation
Actually Paid
to PEO(2)
 
 
Average
Summary
Compensation
Table Total for
Non-PEO
NEOs(3)
 
 
Average
Compensation
Actually Paid
to Non-PEO
NEOs(4)
 
 
Value of Initial Fixed $100
Investment Based On:
 
 
Net
Income/(Loss)
(millions)
 
 
Earnings
from
Shipping
Operations
(ESO)
(millions)(6)
 
Total
Shareholder
Return
 
 
Peer Group
Total
Shareholder
Return(5)
 
(a)
 
 
(b)
 
 
(c)
 
 
(d)
 
 
(e)
 
 
(f)
 
 
(g)
 
 
(h)
 
 
(i)
2025
 
 
$4,505,569
 
 
$6,729,203
 
 
$1,781,759
 
 
$2,448,749
 
 
$470.75
 
 
$196.00
 
 
$309.26
 
 
$388.59
2024
 
 
$3,993,171
 
 
$2,725,636
 
 
$1,841,147
 
 
$1,391,984
 
 
$324.72
 
 
$199.66
 
 
$416.72
 
 
$514.19
2023
 
 
$4,275,366
 
 
$5,922,656
 
 
$1,856,498
 
 
$2,412,331
 
 
$364.24
 
 
$197.26
 
 
$556.45
 
 
$670.43
2022
 
 
$5,409,147
 
 
$10,805,863
 
 
$2,207,085
 
 
$3,985,834
 
 
$254.84
 
 
$147.23
 
 
$387.90
 
 
$484.22
2021
 
 
$3,052,550
 
 
$2,366,989
 
 
$1,342,210
 
 
$1,121,434
 
 
$97.07
 
 
$128.49
 
 
$(134.67)
 
 
$(15.23)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1)
The dollar amounts reported in column (b) are the amounts of total compensation reported for Ms. Lois Zabrocky (who was our President and Chief Executive Officer for all years presented) in the “Total” column of the Summary Compensation Table (“SCT”).
(2)
The dollar amounts reported in column (c) represent the amount of compensation actually paid to Ms. Zabrocky, as computed in accordance with Item 402(v) of Regulation S-K (“CAP”).
(3)
The dollar amounts reported in column (d) represent the average of the amounts reported for our non-CEO NEOs as a group in the “Total” column of the SCT for each applicable year. The non-CEO NEOs included for purposes of calculating the average amounts in each applicable year are as follows: Messrs. Jeffrey D. Pribor, James D. Small III, Derek G. Solon and William F. Nugent.
(4)
The dollar amounts reported in column (e) represent the average amount of CAP for the non-CEO NEOs as a group, as computed in accordance with Item 402(v) of Regulation S-K.
(5)
The dollar amounts reported in column (g) show changes over our past five fiscal years in the value of $100 (assuming reinvestment of dividends), invested in a market-capitalization weighted index of our 2025 Peer Group, which consists of publicly traded companies used to determine target compensation for 2025, as described above in “Compensation Discussion and Analysis.” Compared to the 2024 Peer Group approved in March 2024 for 2024 compensation setting, in 2025, Eagle Bulk Shipping Inc. and Cmb.Tech NV (f/k/a Euronav NV) were removed, and Bristow Group Inc., Excelerate Energy, Inc., Helix Energy Solutions Group, Inc., Landstar System, Inc., and World Kinect Corporation were added pursuant to the criteria outlined in “Compensation Discussion and Analysis,” in consultation with LB&Co. The 2024 Peer Group as disclosed in our 2025 Proxy Statement included – Algoma Central Corporation, Dorian LPG Ltd., Eagle Bulk Shipping Inc., Cmb.Tech NV, Genco Shipping & Trading Limited, Genesis Energy, L.P., Kirby Corporation, Matson, Inc., Tidewater Inc., and TORM plc. Had the 2024 Peer Group been used to calculate cumulative TSR in 2021, 2022, 2023, 2024 and 2025, Peer Group TSR would have been $138.23, $188.23, $269.09, $265.11 and $273.42, respectively.
(6)
The dollar amounts reported in column (i) represent ESO as defined and presented in the CD&A above.
       
Company Selected Measure Name Earnings from Shipping Operations        
Named Executive Officers, Footnote
(1)
The dollar amounts reported in column (b) are the amounts of total compensation reported for Ms. Lois Zabrocky (who was our President and Chief Executive Officer for all years presented) in the “Total” column of the Summary Compensation Table (“SCT”).
(2)
The dollar amounts reported in column (c) represent the amount of compensation actually paid to Ms. Zabrocky, as computed in accordance with Item 402(v) of Regulation S-K (“CAP”).
(3)
The dollar amounts reported in column (d) represent the average of the amounts reported for our non-CEO NEOs as a group in the “Total” column of the SCT for each applicable year. The non-CEO NEOs included for purposes of calculating the average amounts in each applicable year are as follows: Messrs. Jeffrey D. Pribor, James D. Small III, Derek G. Solon and William F. Nugent.
       
Peer Group Issuers, Footnote
(5)
The dollar amounts reported in column (g) show changes over our past five fiscal years in the value of $100 (assuming reinvestment of dividends), invested in a market-capitalization weighted index of our 2025 Peer Group, which consists of publicly traded companies used to determine target compensation for 2025, as described above in “Compensation Discussion and Analysis.” Compared to the 2024 Peer Group approved in March 2024 for 2024 compensation setting, in 2025, Eagle Bulk Shipping Inc. and Cmb.Tech NV (f/k/a Euronav NV) were removed, and Bristow Group Inc., Excelerate Energy, Inc., Helix Energy Solutions Group, Inc., Landstar System, Inc., and World Kinect Corporation were added pursuant to the criteria outlined in “Compensation Discussion and Analysis,” in consultation with LB&Co. The 2024 Peer Group as disclosed in our 2025 Proxy Statement included – Algoma Central Corporation, Dorian LPG Ltd., Eagle Bulk Shipping Inc., Cmb.Tech NV, Genco Shipping & Trading Limited, Genesis Energy, L.P., Kirby Corporation, Matson, Inc., Tidewater Inc., and TORM plc. Had the 2024 Peer Group been used to calculate cumulative TSR in 2021, 2022, 2023, 2024 and 2025, Peer Group TSR would have been $138.23, $188.23, $269.09, $265.11 and $273.42, respectively.
       
Changed Peer Group, Footnote
(5)
The dollar amounts reported in column (g) show changes over our past five fiscal years in the value of $100 (assuming reinvestment of dividends), invested in a market-capitalization weighted index of our 2025 Peer Group, which consists of publicly traded companies used to determine target compensation for 2025, as described above in “Compensation Discussion and Analysis.” Compared to the 2024 Peer Group approved in March 2024 for 2024 compensation setting, in 2025, Eagle Bulk Shipping Inc. and Cmb.Tech NV (f/k/a Euronav NV) were removed, and Bristow Group Inc., Excelerate Energy, Inc., Helix Energy Solutions Group, Inc., Landstar System, Inc., and World Kinect Corporation were added pursuant to the criteria outlined in “Compensation Discussion and Analysis,” in consultation with LB&Co. The 2024 Peer Group as disclosed in our 2025 Proxy Statement included – Algoma Central Corporation, Dorian LPG Ltd., Eagle Bulk Shipping Inc., Cmb.Tech NV, Genco Shipping & Trading Limited, Genesis Energy, L.P., Kirby Corporation, Matson, Inc., Tidewater Inc., and TORM plc. Had the 2024 Peer Group been used to calculate cumulative TSR in 2021, 2022, 2023, 2024 and 2025, Peer Group TSR would have been $138.23, $188.23, $269.09, $265.11 and $273.42, respectively.
       
PEO Total Compensation Amount $ 4,505,569 $ 3,993,171 $ 4,275,366 $ 5,409,147 $ 3,052,550
PEO Actually Paid Compensation Amount $ 6,729,203 2,725,636 5,922,656 10,805,863 2,366,989
Adjustment To PEO Compensation, Footnote
Reconciliation of Summary Compensation Table Total to Compensation Actually Paid for PEO
 
 
 
 
Year
 
 
2025
Summary Compensation Table Total
 
 
$4,505,569
(Minus): Grant Date Fair Value of Equity Awards Granted in Fiscal Year
 
 
($2,618,159)
Plus: Fair Value at Fiscal Year End of Outstanding and Unvested Equity Awards Granted in the Fiscal Year
 
 
$4,002,600
Plus/(Minus): Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years
 
 
$648,437
Plus: Fair Value at Vesting of Equity Awards Granted and Vested in the Fiscal Year
 
 
—
Plus: Change in Fair Value as of the Vesting Date of Equity Awards Granted in Prior Fiscal Years that Vested in the Fiscal Year
 
 
$190,756
(Minus): Fair Value as of the Prior Fiscal Year End of Equity Awards Granted in Prior Fiscal Years that Failed to Meet Vesting Conditions in the Fiscal Year
 
 
—
Plus: Value of Dividends or Other Earnings Paid on Equity Awards Not Otherwise Reflected in Total Compensation
 
 
—
Compensation Actually Paid
 
 
$6,729,203
 
 
 
 
Our PEO does not have any accumulated benefit under any defined benefit or actuarial pension plans; accordingly, we did not deduct or add any amounts with respect to defined benefit pension plans in calculating CAP to the PEO.
For purposes of the above adjustments, the fair value of equity awards on the applicable date were determined in accordance with FASB’s ASC Topic 718, using valuation methodologies that are generally consistent with those used to determine the grant-date fair value for accounting purposes.
The table below contains ranges of assumptions used in the valuation of outstanding equity awards for the relevant fiscal year(s). For more information, please see the notes to our financial statements in our Annual Report on Form 10-K and the footnotes to the Summary Compensation Table of this proxy statement.
 
 
 
 
 
 
 
Fiscal Year 2025
Restricted Stock Units
 
 
 
Stock Price
 
 
$31.61 - $48.55
Performance Share Units
 
 
 
Financial Metric Multiplier
 
 
70% - 150%
TSR Realized Performance (Percentile)
 
 
112.5P
Volatility
 
 
35.9% - 40.2%
Risk-Free Interest Rate
 
 
3.41% - 3.42%
 
 
 
 
        
Non-PEO NEO Average Total Compensation Amount $ 1,781,759 1,841,147 1,856,498 2,207,085 1,342,210
Non-PEO NEO Average Compensation Actually Paid Amount $ 2,448,749 1,391,984 2,412,331 3,985,834 1,121,434
Adjustment to Non-PEO NEO Compensation Footnote
Reconciliation of Summary Compensation Table Total to Compensation Actually Paid for Non-PEO NEOs
 
 
 
 
Year
 
 
2025
Summary Compensation Table Total
 
 
$1,781,759
(Minus): Grant Date Fair Value of Equity Awards Granted in Fiscal Year
 
 
($683,600)
Plus: Fair Value at Fiscal Year End of Outstanding and Unvested Equity Awards Granted in the Fiscal Year
 
 
$1,045,076
Plus/(Minus): Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Years
 
 
$231,236
Plus: Fair Value at Vesting of Equity Awards Granted and Vested in the Fiscal Year
 
 
—
Plus/(Minus): Change in Fair Value as of the Vesting Date of Equity Awards Granted in Prior Fiscal Years that Vested in the Fiscal Year
 
 
$74,277
(Minus): Fair Value as of the Prior Fiscal Year End of Equity Awards Granted in Prior Fiscal Years that Failed to Meet Vesting Conditions in the Fiscal Year
 
 
—
Plus: Value of Dividends or Other Earnings Paid on Equity Awards Not Otherwise Reflected in Total Compensation
 
 
—
Compensation Actually Paid
 
 
$2,448,749
 
 
 
 
Our non-PEO NEOs do not have any accumulated benefit under any defined benefit or actuarial pension plans; accordingly, we did not deduct or add any amounts with respect to defined benefit pension plans in calculating CAP to non-PEO NEOs.
For purposes of the above adjustments, the fair value of equity awards on the applicable date were determined in accordance with FASB’s ASC Topic 718, using valuation methodologies that are generally consistent with those used to determine the grant-date fair value for accounting purposes.
The table below contains ranges of assumptions used in the valuation of outstanding equity awards for the relevant fiscal year(s). For more information, please see the notes to our financial statements in our Annual Report on Form 10-K and the footnotes to the Summary Compensation Table of this proxy statement.
 
 
 
 
 
 
 
Fiscal Year 2025
Restricted Stock Units
 
 
 
Stock Price
 
 
$31.61 - $48.55
Performance Share Units
 
 
 
Financial Metric Multiplier
 
 
70% - 150%
TSR Realized Performance (Percentile)
 
 
112.5P
Volatility
 
 
35.9% - 40.2%
Risk-Free Interest Rate
 
 
3.41% - 3.42%
 
 
 
 
        
Compensation Actually Paid vs. Total Shareholder Return        
Compensation Actually Paid vs. Net Income        
Compensation Actually Paid vs. Company Selected Measure        
Total Shareholder Return Vs Peer Group        
Tabular List, Table
Most Important Market Measures
1. Earnings from Shipping Operations
2. Return on Invested Capital
3. Total Shareholder Return
       
Total Shareholder Return Amount $ 470.75 324.72 364.24 254.84 97.07
Peer Group Total Shareholder Return Amount 196 199.66 197.26 147.23 128.49
Net Income (Loss) $ 309,260,000 $ 416,720,000 $ 556,450,000 $ 387,900,000 $ (134,670,000)
Company Selected Measure Amount 388,590,000 514,190,000 670,430,000 484,220,000 (15,230,000)
PEO Name Ms. Lois Zabrocky Ms. Lois Zabrocky Ms. Lois Zabrocky Ms. Lois Zabrocky Ms. Lois Zabrocky
Additional 402(v) Disclosure
The Company operates in the maritime tanker shipping industry, which is a highly cyclical business where results often reflect an underlying commodity-based rate environment. Accordingly, the results of our business can fluctuate significantly from time to time, driven by changes in shipping rates and vessel valuations that can be caused by, among other things, geopolitical events, global or regional conflicts, government action and regulatory developments, in the global capital markets, environmental incidents and various other factors discussed in detail in our Annual Report. As part of its effort to appropriately align compensation incentives to management performance, the Compensation Committee annually evaluates and implements both fixed and variable components of compensation. Due, however, to the volatile nature of the industry, variable compensation actually paid can be significantly affected (either positively or negatively) by short-to-medium-term changes in market rates and INSW stock performance.
       
Peer Group Total Shareholder Return Amount Using Previous Peer Group $ 273.42 $ 265.11 $ 269.09 $ 188.23 $ 138.23
Stock Price, Minimum, Restricted Stock Units | $ / shares $ 31.61        
Stock Price, Maximum, Restricted Stock Units | $ / shares $ 48.55        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Financial Metric Multipliers, Minimum for Performance Share Units 70.00%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Financial Metric Multipliers, Maximum for Performance Share Units 150.00%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Total Shareholder Return Realized Performance (Percentile), Performance Share Units | Percentile 112.5        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Volatility Rate, Minimum for Performance Share Units 35.90%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Volatility Rate, Maximum for Performance Share Units 40.20%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum for Performance Share Units 3.41%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum for Performance Share Units 3.42%        
Measure:: 1          
Pay vs Performance Disclosure          
Name Earnings from Shipping Operations        
Measure:: 2          
Pay vs Performance Disclosure          
Name Return on Invested Capital        
Measure:: 3          
Pay vs Performance Disclosure          
Name Total Shareholder Return        
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ (2,618,159)        
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 4,002,600        
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 648,437        
PEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 190,756        
PEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
PEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (683,600)        
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 1,045,076        
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 231,236        
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 74,277        
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
Non-PEO NEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ 0