CONTINGENCIES (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Guarantor Obligations [Line Items]
Issued guaranties	$ 32,552,000
Guarantor obligations, term	All of these instruments have an expiration date within four years
Performance Bonds [Member]
Guarantor Obligations [Line Items]
Issued guaranties	25,904,000
Standby Letters Of Credit [Member]
Guarantor Obligations [Line Items]
Issued guaranties	6,648,000
Gulfco Marine Superfund Site [Member]
Guarantor Obligations [Line Items]
Number of other companies also named as Potentially Responsible Parties ("PRPs")	3
Number of companies named as Potentially Responsible Parties ("PRPs")	4
EPA incurred cleanup expense	9,943,000
EPA oversight costs	$ 2,258,000
Number of defendants seeking contribution and indemnity under CERCLA	21
Collision with M/S Summer Wind [Member]
Loss Contingencies [Line Items]
Number of vessels damaged in collision resulting in fuel oil discharge	1
Number of actions filed against the Company	2
Number of crewmembers alleging damages	2