Income Taxes (Components of Net Deferred Tax Asset (Liability) ) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
DEFERRED TAX LIABILITIES
Fixed Assets	$ (3,853)	$ (12,376)
Drydock Activities	(4,604)	(5,275)
Insurance and Claims Reserve	(339)	(228)
Deferred Gain	(10,993)
Unremitted Foreign Earnings	(5,329)
Total Deferred Tax Liabilities	(25,118)	(17,879)
DEFERRED TAX ASSETS
Net Operating Loss Carryforwards	22,036	17,753
Minimum Tax Credit	5,425	5,179
Deferred Gain		1,973
Pension/Postretirement	2,140	2,500
Intangibles/Goodwill	10,163	1,285
Stock Based Compensation	312
Unconsolidated Subsidiaries	520	383
Work Opportunity Tax Credit	537	537
Lease Incentives	835	503
Assets Held for Sale	780	931
Other Assets	863	771
Total Deferred Tax Assets	43,611	31,815
Valuation Allowance	(18,493)	(13,936)
Net Deferred Tax Assets	25,118	17,879
DEFERRED TAX COMPONENTS
Current	309	408
Non-current	$ (309)	$ (408)