RECENT ACCOUNTING PRONOUNCEMENTS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies
Percentage of spot charter revenues to Company’s total voyage revenues	4.80%
Number of vessels operating on spot charters | item	3
Number of vessels | item	30
Letter of credit
Summary Of Significant Accounting Policies
Outstanding letter of credit | $	$ 1.4	$ 1.4	$ 1.4
Cash held as security | $	$ 1.5	$ 1.5	$ 1.5