Operating Segments (Reconciliation Of The Totals Reported For The Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating Segments [Abstract]
Total Revenues	$ 74,410	$ 77,938	$ 223,856	$ 233,959
Voyage Expenses	61,629	64,832	187,586	195,931
Gross Voyage Profit	12,605	12,746	35,906	37,323
Vessel Depreciation	6,290	6,130	19,528	17,705
Other Depreciation	18	17	54	51
Gross Profit	6,297	6,599	16,324	19,567
Administrative and General Expenses	5,398	4,994	16,209	16,597
Loss on Sale of Other Assets	1	6	1	6
Less: Net Loss of Unconsolidated Entities	(176)	(360)	(364)	(705)
Total Other Operating Expenses	5,223	4,640	15,846	15,898
Operating Income	$ 1,074	$ 1,959	$ 478	$ 3,669