Operating Segments (Reconciliation Of The Totals Reported For The Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Segments [Abstract]
Revenues	$ 66,509	$ 74,410	$ 201,843	$ 223,856
Voyage Expenses	52,569	55,450	158,589	170,685
Amortization Expense	3,657	6,142	13,192	16,791
Gross Voyage Profit	10,441	12,642	31,778	36,016
Vessel Depreciation	5,740	6,291	16,773	19,528
Other Depreciation	185	181	556	545
Gross Profit	4,516	6,170	14,449	15,943
Administrative and General Expenses	5,476	5,271	15,286	15,828
Impairment Loss	3,042		4,870
(Gain) Loss on Sale of Assets	106	1	(4,573)	1
Less: Net Income (Loss) of Unconsolidated Entities	158	(176)	1,716	(364)
Total Other Operating Expenses	8,782	5,096	17,299	15,465
Operating Income (Loss)	$ (4,266)	$ 1,074	$ (2,850)	$ 478