Accounts Payable And Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts Payable And Accrued Liabilities [Abstract]
Accrued Voyage Expenses	$ 38,035	$ 38,310
Trade Accounts Payable	5,301	3,284
Accrued Salaries and Benefits	3,845	5,050
Lease Incentive Obligation	1,901	1,901
Self-Insurance Liability	1,187	1,186
Accrued Insurance Premiums	891	602
Short Term Derivatives Liability	60	257
Straight Line Charter Escalation	58	306
Accounts Payable and Accrued Liabilities	$ 51,278	$ 50,896