Acquisitions (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended				1 Months Ended				0 Months Ended		0 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended						12 Months Ended
	Mar. 25, 2011 item	Dec. 31, 2013	Jul. 31, 2013	Dec. 31, 2012	Dec. 31, 2006 item	Nov. 30, 2012 United Ocean Services, LLC [Member]	Dec. 31, 2013 United Ocean Services, LLC [Member] T	Mar. 31, 2013 United Ocean Services, LLC [Member]	Dec. 31, 2012 United Ocean Services, LLC [Member]	Jun. 06, 2012 Frascati Shops, Inc. And Tower, LLC [Member]	Aug. 06, 2012 Frascati Shops, Inc. And Tower, LLC [Member]	Mar. 25, 2011 Dry Bulk Cape Holding Inc. [Member]	Mar. 25, 2011 Dry Bulk Cape Holding Inc. [Member]	Mar. 31, 2011 Dry Bulk Cape Holding Inc. [Member]	Dec. 31, 2011 Dry Bulk Cape Holding Inc. [Member]	Dec. 31, 2013 Dry Bulk Cape Holding Inc. [Member]	Jan. 31, 2012 Dry Bulk Cape Holding Inc. [Member] item	Jan. 31, 2011 Dry Bulk Cape Holding Inc. [Member]	Dec. 31, 2013 Handysize Bulk Carriers [Member] United Ocean Services, LLC [Member] item	Dec. 31, 2013 Tug And Barge Units [Member] United Ocean Services, LLC [Member] item	Dec. 31, 2013 Cap Size Vessel [Member] item	Mar. 31, 2011 Cap Size Vessel [Member]	Jan. 31, 2012 Cap Size Vessel [Member] Dry Bulk Cape Holding Inc. [Member] item	Mar. 24, 2011 Cap Size Vessel [Member] Dry Bulk Cape Holding Inc. [Member] item	Jan. 31, 2012 Supramax Vessel [Member] Dry Bulk Cape Holding Inc. [Member] item	Mar. 24, 2011 Supramax Vessel [Member] Dry Bulk Cape Holding Inc. [Member] item
Business Acquisition [Line Items]
Acquisition date						Nov. 30, 2012				Aug. 06, 2012			Mar. 25, 2011
Subsidiary ownership interest acquired			23.70%			100.00%						50.00%	50.00%
Equity interest held by company (in hundredths)	100.00%															100.00%
Amount of total consideration						$ 114,700,000				$ 4,500,000
Cash payment included in purchase price						112,200,000				623,000
Debt assumed										3,500,000
Assumption of miscellaneous payables										412,000
Post-closing settlement payment								2,500,000
Acquisition expenses									1,800,000	40,000
Weight of U.S. Flag Jones Act dry bulk fleet							131,000
Cash payment received													1,500,000
Number of vessels controlled by acquirer																	2						1		1
Number of Vessels Owned or Operated	2				2														2	4				2		2
Appraised value of vessels																						84,000,000
Book Value Of Vessels																						53,600,000
Fair value of intangible asset relating to time charter contracts in place												5,200,000	5,200,000
Fair value of net assets acquired						112,810,000					(205,000)			69,000,000
Discount rate (in hundredths)														5.10%
Assets, Total		656,375,000		638,016,000														32,700,000
Gain on Previously Held 50% Interest	18,300,000												18,300,000
Bargain Purchase Gain												500,000	500,000
Replacement cost, depreciated useful life, in years																					25 years
Current scrap value																					12,000,000
Scrap value, dollar per light ton displacement																					490
Weight of vessel																					24,413
Intangible assets, market rate per day		18,500
Third party valuation, commission percentage		6.25%
Discount rate used, based on weighted average cost of capital		13.00%
Revenue															7,300,000
Net income															$ 2,000,000