Unconsolidated Entities (Summarized Equity In Net Income (Loss) Of Unconsolidated Entities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]
Total Equity in Net Income (Loss) of Unconsolidated Entities	$ 893	$ (108)
Oslo Bulk, AS [Member]
Schedule of Equity Method Investments [Line Items]
Total Equity in Net Income (Loss) of Unconsolidated Entities	515	(62)
Oslo Bulk Holding Pte, Ltd (formerly Tony Bulkers) [Member]
Schedule of Equity Method Investments [Line Items]
Total Equity in Net Income (Loss) of Unconsolidated Entities	120	(18)
Terminales Transgolfo, S.A. DE C.V. [Member]
Schedule of Equity Method Investments [Line Items]
Total Equity in Net Income (Loss) of Unconsolidated Entities	(74)	(28)
Saltholmen Shipping Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Total Equity in Net Income (Loss) of Unconsolidated Entities	251
Brattholmen Shipping Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Total Equity in Net Income (Loss) of Unconsolidated Entities	$ 81