XML 65 R52.htm IDEA: XBRL DOCUMENT v3.3.1.900
Significant accounting policies and recent accounting pronouncements (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Change in Accounting Estimate [Line Items]      
Vessels' depreciation method straight-line basis    
Vessel's useful life 25 years    
Provision for doubtful receivables $ 0 $ 0  
Fleet utilization assumption 98.00%    
Inflation assumption 3.00%    
Impairment loss $ 321,978,000 0 $ 0
Assets held for sale $ 0 0  
Number of interest rate derivatives held by the Company 9    
Salvage Value      
Change in Accounting Estimate [Line Items]      
Change in Accounting Estimate, Description Effective as of January 1, 2015, following management's reassessment of the residual value of the Company's vessels, the Company increased the estimated scrap rate per light weight tonnage from $0.2 to $0.3. The current value of $0.3 was based on the historical average demolition prices prevailing in the market.    
Change in Accounting Estimate, Financial Effect The change in this accounting estimate, which pursuant to ASC 250 "Accounting Changes and Error Corrections" was applied prospectively and did not require retrospective application, decreased the depreciation expense and the net loss for the year ended December 31, 2015 by $6,337 or $0.03 loss per basic and diluted share.    
Vessel salvage value per LWT $ 300 $ 200  
Effect of change in acounting estimate, decrease of charge to net income / (loss) $ 6,337,000    
Effect of change in accounting estimate, loss on basic and diluted earnings per share | $ / shares $ 0.03    
Designated as cash flow hedges      
Change in Accounting Estimate [Line Items]      
Number of interest rate derivatives held by the Company 4