Operating Segments (Reconciliation Of The Totals Reported For The Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Segments [Abstract]
Revenues	$ 72,694	$ 81,124
Voyage Expenses	62,632	69,591
Gross Voyage Profit	9,954	11,263
Vessel Depreciation	6,721	5,771
Other Depreciation	18	23
Gross Profit	3,215	5,469
Administrative and General Expenses	5,579	5,433
Less: Net Loss of Unconsolidated Entities	(108)	(270)
Total Other Operating Expenses	5,471	5,163
Operating (Loss) Income	$ (2,256)	$ 306