Assets Held For Sale (Details) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) item	Mar. 31, 2015 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items]
Net cash proceeds from sales				$ 31,025	$ 1,659
Loss on Extinguishment of Debt				585	225
Goodwill impairment loss		$ 800		(2,735)
Impairment of definite-life intangibles		400
Impairment charges of assets held for sale				$ (154,463)	(38,213)
Handysize Vessel [Member]
Property, Plant and Equipment [Line Items]
Number of vessels sold | item			1
Loss on Extinguishment of Debt			$ (95)
Impairment charges of assets held for sale		(3,300)			$ 31,629	[1]
Handysize Vessel [Member] | Subsequent Event [Member]
Property, Plant and Equipment [Line Items]
Number of vessels sold | item	2
Net cash proceeds from sales	$ 20,700
Jones Act Tug-Barge [Member]
Property, Plant and Equipment [Line Items]
Net cash proceeds from sales		160
Supramax Vessel [Member]
Property, Plant and Equipment [Line Items]
Decrease in debt outstanding		11,300
Loss on Extinguishment of Debt		$ 100
PCTC [Member] | International Flag PCTC [Member]
Property, Plant and Equipment [Line Items]
Number of vessels sold | item		1
Net cash proceeds from sales		$ 15,400
Decrease in debt outstanding		31,300
Loss on Extinguishment of Debt		$ 130

[1] The loss of $31.6 million includes the loss related to three handysize vessels of approximately $28.3 million and a tanker of approximately $3.3 million that were written down to their fair market value less costs to sell. The tanker was sold during the fourth quarter of 2014. The assets held for sale balance of $48.7 million represents the three handysize vessels and their related equipment.