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Assets Held For Sale (Details)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
item
Mar. 31, 2015
item
Dec. 31, 2014
USD ($)
item
Jun. 30, 2015
USD ($)
item
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Property, Plant and Equipment [Line Items]              
Long Term Assets Held for Sale       $ 48,701,000      
Impairment of Long-Lived Assets held for sale           $ 1,135,000  
Depreciation expense on assets held for use           17,329,000 $ 20,073,000
Short term assets held for sale $ 5,300,000     $ 6,976,000   5,300,000  
Handysize Vessel [Member]              
Property, Plant and Equipment [Line Items]              
Number of vessels held for sale | item   2   3      
Long Term Assets Held for Sale       $ 48,700,000      
Number of vessels sold | item     1        
Number of vessels held in use | item   2     2    
Impairment of Long-Lived Assets held for sale   $ 1,800,000     $ 1,800,000    
Depreciation expense on assets held for use         $ 0    
Jones Act Tug-Barge [Member]              
Property, Plant and Equipment [Line Items]              
Number of vessels held for sale | item       1      
Impairment of Long-Lived Assets held for sale $ 1,100,000         1,100,000  
Depreciation expense on assets held for sale           $ 0  
Tug-Barge Unit And Inventory Related To Handysize Vessels [Member]              
Property, Plant and Equipment [Line Items]              
Short term assets held for sale       $ 7,000,000