LEASES (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Estimated For Lease Termination Costs	$ 30,187
Minimum Percentage Of Barrel Volume	50.00%
Deferred Revenue	27,100
Additional Compensation For Reduction In Minimum Barrels	13,300
Voyage Revenue	40,400
Replacement Agreement Runs Period	April 2020
Charters In [Member]
Commitments to charter in vessels, Number of Units	39
Bareboat Charters In [Member]
Commitments to charter in vessels, Number of Units	19
Time Charters In [Member]
Commitments to charter in vessels, Number of Units	20
Charter Out [Member] | Contract Of Affreightmen [Member]
Operating Leases, Future Minimum Payments Receivable, Current	22,254
Operating Leases, Future Minimum Payments Receivable, in Two Years	21,375
Operating Leases, Future Minimum Payments Receivable, in Three Years	21,699
Operating Leases, Future Minimum Payments Receivable, in Four Years	22,023
Operating Leases, Future Minimum Payments Receivable, in Five Years	22,347
Operating Leases, Future Minimum Payments Receivable, Thereafter	52,085
Office Space [Member]
Operating Leases, Rent Expense, Net	$ 4,550	$ 4,614	$ 5,013