Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Jul. 31, 2011	Jun. 30, 2011
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity investee	$ 84		$ (852)		$ 665		$ 22
Dividends from equity investee					0		750
Oslo Bulk AS [Member]
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity investee	224		(946)		1,123		(1,202)
Equity investee ownership interest (in hundredths)	25.00%				25.00%				25.00%	25.00%
Oslo Bulk Holding Pte. Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity investee	26	[1]	125	[1],[2]	(213)	[1],[2]	17	[1],[2]
Other Equity Investments [Member]
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity investee	$ (166)	[3]	$ (31)	[3]	$ (245)		$ 1,207
RTI Logistics [Member]
Schedule of Equity Method Investments [Line Items]
Equity investee ownership interest (in hundredths)			50.00%				50.00%
Terminales Transgolfo [Member]
Schedule of Equity Method Investments [Line Items]
Equity investee ownership interest (in hundredths)			49.00%				49.00%
HAV Shipmanagement [Member]
Schedule of Equity Method Investments [Line Items]
Equity investee ownership interest (in hundredths)			12.50%				12.50%
Dry Bulk Cape Holding Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Equity investee ownership interest (in hundredths)			50.00%				50.00%

[1] 1 Tony Bulkers formally changed its name to Oslo Bulk Holding, PTE Ltd in 2012.

[2] Information used by Chief Decision Makers; see "Management's Discussion and Analysis of Financial Condition and Results of Operation- Non-GAAP Financial Measures."

[3] In 2011 for all applicable periods, includes results from RTI Logistics (50% equity), Terminales Transgolfo (49% equity), HAV Shipmanagement (12.5% equity) and Dry Bulk Cape Holding (50% equity). In 2012 includes results from Terminales Transgolfo only as the balance of the other unconsolidated entities have either been sold or consolidated with their parent.