Operating Segments (Reconciliation Of The Totals Reported For The Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Segments [Abstract]
Revenues		$ 77,938	$ 61,162	$ 233,959	$ 186,686
Voyage Expenses		64,832	45,394	195,931	143,246
Gross Voyage Profit		12,746	15,852	37,323	44,105
Vessel Depreciation		6,130	6,100	17,705	18,180
Other Depreciation		17	9	51	9
Gross Profit		6,599	9,743	19,567	25,916
Administrative and General Expenses		4,994	5,643	16,597	15,871
Loss/(Gain) on Sale of Other Assets	(3,800)	6	3	6	(4,463)
Net (Income) Loss of Unconsolidated Entities		(360)	84	(705)	665
Total Other Operating Expenses		4,640	5,730	15,898	12,073
Operating Income		$ 1,959	$ 4,013	$ 3,669	$ 13,843