Unconsolidated Entities (Summarized Equity In Net Income (Loss) Of Unconsolidated Entities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity in Net Income (Loss) of Unconsolidated Entities	$ 142	$ 893
Oslo Bulk AS [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Net Income (Loss) of Unconsolidated Entities		515
Oslo Bulk Holding Pte. Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Net Income (Loss) of Unconsolidated Entities		120
Terminales Transgolfo [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Net Income (Loss) of Unconsolidated Entities	$ 142	(74)
Saltholmen Shipping Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Net Income (Loss) of Unconsolidated Entities		251
Brattholmen Shipping Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Net Income (Loss) of Unconsolidated Entities		$ 81