Income Taxes (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2013 T	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Provision (benefit) for income taxes		$ (11,963,000)	$ (157,000)	$ 680,000
(Loss) income before taxes and equity in net loss unconsolidated entities		7,855,000	22,020,000	32,639,000
Deferred tax assets, valuation allowance		869,000	13,514,000
Daily notional shipping income per 100 tons of the net tonnage of the vessel in excess of 25000 net tons		0.40
Daily notional shipping income per 100 tons of the net tonnage of the vessel up to 25000 net tons		0.20
Base quantity for calculation of daily notional shipping income		100
Net quantity range considered for calculation of daily notional shipping income		25,000
Foreign income taxes		(4,000)	205,000	588,000
Income tax current recognition of earnings of foreign subsidiaries		0	2,000,000	0
Favorable adjustment from audit of 2009 federal income tax return			94,000
Reduction to its current year U.S. net operating loss			2,000,000
Net operating loss carryforward, increase	2,000,000
Tax on book/tax temporary differences		633,000
Tax benefit attributable to projected 2014 utilization of Net Operating Loss Carryforwards		2,500,000
Increase in total deferred income tax assets			2,800,000
Tonnage Tax Included in Income Tax Benefit		56,000	64,000	78,000
Foreign earnings indefinitely reinvested		2,800,000	4,400,000	24,400,000
Corporate tax rate		35.00%	35.00%	35.00%
Federal [Member]
Income Taxes [Line Items]
Minimum tax credit carryforwards		5,200,000
Net operating loss carryforwards		41,600,000	27,500,000
Operating Loss Carryforwards Generated During Period		14,100,000
State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards		23,100,000	17,200,000
Operating Loss Carryforwards Generated During Period		5,900,000
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards		6,400,000
Operating Loss Carryforwards Generated During Period		$ 130,000
Minimum [Member] | Federal [Member]
Income Taxes [Line Items]
Expiration period		2025
Minimum [Member] | State [Member]
Income Taxes [Line Items]
Expiration period		2025
Maximum [Member] | Federal [Member]
Income Taxes [Line Items]
Expiration period		2033
Maximum [Member] | State [Member]
Income Taxes [Line Items]
Expiration period		2033