Acquisitions (Narrative) (Details) (USD $)		0 Months Ended		1 Months Ended
	Sep. 30, 2013 T item	Aug. 06, 2012 Frascati Shops, Inc. and Tower, LLC [Member]	Sep. 30, 2012 Frascati Shops, Inc. and Tower, LLC [Member]	Nov. 30, 2012 UOS [Member]	Dec. 31, 2012 UOS [Member]
Business Acquisition [Line Items]
Acquisition date		Aug. 06, 2012		Nov. 30, 2012
Subsidiary ownership interest acquired (in hundredths)				100.00%
Amount of total consideration		$ 4,500,000		$ 114,700,000
Cash payment included in purchase price		623,000		112,200,000
Debt assumed		3,500,000
Post-closing settlement payment				2,500,000
Acquisition expenses			40,000		1,800,000
Weight of U.S. Flag Jones Act dry bulk fleet	131,000
Number of handysize bulkers controlled by acquiree	2
Number of tug-barge units controlled by acquiree	4
Assumption of miscellaneous payables		$ 383,000