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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 15, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes        
Gross transportation tax   $ 0 $ 0 $ 365
Ownership percentage held by each shareholder (as a percent)   5.00% 5.00% 5.00%
Federal tax rate (as a percent)     21.00%  
Tax rate on 50% of shipping income if not qualified for Section 883   4.00%    
Tax on branch profits   30.00%    
Percentage of shipping income sourced to United States if attributable to transportation exclusively between United States ports   100.00%    
Percentage of shipping income attributable to transportation that begins or ends in the United States included in United States source shipping income   50.00%    
Percentage of shipping income sourced to United States if no transportation is attributable to United States   0.00%    
Minimum        
Income Taxes        
Combined ownership held by 5% shareholders (as a percent)   50.00%    
Combined ownership of shareholders for more than half the days of year (as a percent)       50.00%
Percentage of value of outstanding shares owned by the qualified shareholders of a foreign corporation   50.00%    
Maximum        
Income Taxes        
Combined ownership of shareholders for more than half the days of year (as a percent)   50.00% 50.00%  
Singapore | Genco Shipping Pte. Ltd. (GSPL)        
Income Taxes        
Federal tax rate (as a percent)   17.00%    
Initial period of the Maritime Sector Incentive award 10 years      
Initial performance review period of the Maritime Sector Incentive award 5 years      
Singapore | Genco Shipping Pte. Ltd. (GSPL) | Ohter income (expense)        
Income Taxes        
Income tax expense   $ 0 $ 0 $ 0
Denmark | Genco Shipping A/S        
Income Taxes        
Federal tax rate (as a percent)   22.00% 22.00%  
Denmark | Genco Shipping A/S | Ohter income (expense)        
Income Taxes        
Income tax expense   $ 241 $ 79