Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements Of Income [Abstract]
Revenues	$ 294,834	$ 310,128	$ 243,496
Operating Expenses:
Voyage Expenses	223,040	236,701	178,860
Amortization Expense	22,107	16,386	9,601
Vessel Depreciation	26,233	24,363	24,366
Other Depreciation	751	567	609
Administrative and General Expenses	20,985	22,378	22,714
Impairment Loss	38,213
Loss (Gain) on Sale of Other Assets	2	16	(16,625)
Total Operating Expenses	331,331	300,411	219,525
Operating (Loss) Income	(36,497)	9,717	23,971
Interest and Other:
Interest Expense	9,962	9,504	10,409
Derivative (Gain) Loss	(132)	438	485
Gain on Sale of Investment			(580)
Other Income from Vessel Financing	(1,858)	(2,122)	(2,387)
Investment Income	(373)	(114)	(470)
Foreign Exchange Loss (Gain)	184	(5,914)	(5,506)
Total Interest and Other Income	7,783	1,792	1,951
(Loss) Income Before Provision (Benefit) for Income Taxes and Equity in Net Income of Unconsolidated Entities	(44,280)	7,925	22,020
Provision (Benefit) for Income Taxes	10,429	(12,268)	(157)
Equity in Net Income (Loss) of Unconsolidated Entities (Net of Applicable Taxes)	10	(1,661)	(215)
Net (Loss) Income	(54,699)	18,532	21,962
Preferred Stock Dividends	5,221	3,226
Net (Loss) Income Available to Common Stockholders	$ (59,920)	$ 15,306	$ 21,962
Basic and Diluted Earnings (Loss) Per Common Share:
Basic Earnings (Loss) Per Common Share: (in dollars per share)	$ (8.23)	$ 2.11	$ 3.05
Diluted Earnings (Loss) Per Common Share: (in dollars per share)	$ (8.23)	$ 2.10	$ 3.04
Weighted Average Shares of Common Stock Outstanding:
Basic (in shares)	7,284,482	7,237,472	7,195,606
Diluted (in shares)	7,284,482	7,282,676	7,213,288
Common Stock Dividends Per Share (in dollars per share)	$ 1.00	$ 1.00	$ 1.00