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Vessels, Net, detail (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Vessel Cost      
Vessel Cost, Beginning Balance $ 1,224,757 $ 1,160,911  
Transfers from Advances for vessel acquisitions and vessel under construction 100,043 119,520  
Impairment loss   (23,924)  
Transfer to Assets held for sale   (31,750)  
Vessel Cost,Ending Balance 1,324,800 1,224,757 $ 1,160,911
Accumulated Depreciation      
Accumulated Depreciation, Beginning Balance (236,596) (200,488)  
Impairment loss   11,025  
Depreciation (49,485) (47,133) (43,084)
Accumulated Depreciation, Ending Balance (286,081) (236,596) (200,488)
Net Book Value      
Net Book Value, Beginning Balance 988,161 960,423  
Transfers from Advances for vessel acquisitions and vessel under construction 100,043 119,520  
Impairment loss   (12,899)  
Transfer to Assets held for sale   (31,750)  
Depreciation (49,485) (47,133) (43,084)
Net Book Value, Ending Balance 1,038,719 $ 988,161 $ 960,423
Property Plant And Equipment Collateral For Debt $ 1,028,059    
Number Of Vessels As Collateral For Debt | item 36