Voyage and Vessel Operating Expenses - Vessel Operating Expenses (Table) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Vessel operating expenses
Crew wages and related costs	$ 14,498	$ 12,938	$ 12,348
Insurances	2,655	2,399	2,195
Maintenance, Repairs, Spares and Stores	6,779	6,130	4,729
Lubricants	3,046	2,189	1,925
Tonnage taxes	169	123	116
Upgrading Expenses	19	789	301
Miscellaneous	666	679	735
Total vessel operating expenses	$ 27,832	$ 25,247	$ 22,349

The cost of lubricants consumed during the period.

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- Definition

The tonnage taxes for the period.

+ References

No definition available.

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- Definition

The upgrading expenses incurred during the period.

+ References

No definition available.

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- Definition

Costs of maintenance supplies used that are directly related to goods produced and sold, or services rendered, during the reporting period.

+ References

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- Definition

The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales).

+ References

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- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

+ References

No definition available.

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- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Article 5

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- Definition

Expenditures for salaries other than officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

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