Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Description of a specific restructuring plan and related activities including the facts and circumstances leading to the restructuring or decision to exit an activity, and the expected completion date. This concept and related items would be utilized for each plan if multiple exit plans have been implemented in the period.

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- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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Agreements with Executive Officers and Severance and Relocation Costs (Details Textual) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 28, 2013	Mar. 31, 2013	Mar. 31, 2012
Vessel Technical Management Relocation Description		In the first quarter of 2012, the Company announced the relocation of the technical management of its conventional International Flag crude oil tanker fleet from its Newcastle, U.K. office to its Athens, Greece office. In connection therewith, approximately 50 employees were terminated in Newcastle.
Restructuring Charges			$ 905
Restructuring Reserve, Accrual Adjustment		422
Allocated Share-based Compensation Expense	3,209
Bankruptcy Claims, Amount Of Claims Filed		463,013
Executive Officer [Member]
Restructuring Charges		3,714
Chief Executive Officer [Member] \| President [Member]
Bankruptcy Claims, Amount Of Claims Filed		$ 6,399
Employee Relocation [Member]
Number of Employees terminated or relocated			50