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Basis of presentation and Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Basis Of Presentation (Textual) [Abstract] |  |  |
Depreciation of vessels and equipment | $ 73.2 | $ 72.8 | $ 69.0
Interest cost capitalized to vessels and equipment | $ 3.1 | $ 4.2 | $ 10.8
Tax rate in Spain | 30.00% |  |
Effective income tax rate on revenue by Spanish vessels tax credit | 90.00% |  |
Effective tax rate on revenues by Spanish vessels | 3.00% |  |
Interest costs capitalized to vessels and equipment | 3.1 | 4.2 | 10.8
Conventional Tankers [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life in years | 25 |  |
LPG Carriers [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life in years | 30 |  |
LNG Carriers [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life in years | 35 |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The average useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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