Accounts Payable And Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts Payable And Accrued Liabilities [Abstract]
Accrued Voyage Expenses	$ 38,069	$ 36,365
Accrued Expense New Orleans Office Building	6,000
Trade Accounts Payable	6,502	9,343
Accrued Salaries and Benefits	2,868	2,472
Lease Incentive Obligation	3,626	1,901
Self-Insurance Liability	1,187	1,165
Accrued Insurance Premiums	1,204	1,187
Short Term Derivatives Liability	1,040	298
Accounts Payable and Accrued Liabilities	$ 60,496	$ 52,731