FAIR VALUE MEASUREMENTS (Details) (Recurring Basis [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis [Abstract]
Marketable securities	$ 0		$ 12,827
Derivative assets	147		202
Derivative liabilities	(7,940)		(9,446)
Vessels	37,070	[1]	37,070	[1]
Level 1 Inputs [Member]
Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis [Abstract]
Marketable securities	0		12,827
Derivative assets	0		0
Derivative liabilities	0		0
Vessels	0	[1]	0	[1]
Level 2 Inputs [Member]
Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis [Abstract]
Marketable securities	0		0
Derivative assets	147		202
Derivative liabilities	(7,940)		(9,446)
Vessels	37,070	[1]	37,070	[1]
Level 3 Inputs [Member]
Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis [Abstract]
Marketable securities	0		0
Derivative assets	0		0
Derivative liabilities	0		0
Vessels	$ 0	[1]	$ 0	[1]

[1] Represents the appraised fair value of the Rail-Ferry vessels after the impairment charge taken in the third quarter of 2010. The valuation technique used was a weighted average of the cost, comparable sales and income approach. The carrying value of the Rail-Ferry vessels no longer equals the fair value.