Gain On Sale Of Other Assets (Details) (USD $)	1 Months Ended		12 Months Ended		3 Months Ended
	Oct. 22, 2012	Mar. 31, 2012 item	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012 US Flag PCTC Vessel [Member] item	Jun. 30, 2012 Molten Sulphur Carrier [Member] item
Property, Plant and Equipment [Line Items]
Number of International Flag Pure Car Truck Carriers sold		2
Proceeds from sale of other assets		$ 73,900,000
Gain on sale of other assets		3,800,000	(16,000)	16,625,000
Repayments of debt from sale proceeds		36,100,000
Deferred gain on purchase of property					239,000	430,000
Number of vessel sold					1	1
Payments to acquire vessel	3,700,000
Gain recognized from exchange transactions				$ 12,200,000