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Fair value measurements - Fair value on a nonrecurring basis (Table) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value Measurements [Line Items] |  |  |
Impairment loss | $ 0 | $ 29,221 | $ 321,978
Fair Value, Measurements, Nonrecurring |  |  |
Fair Value Measurements [Line Items] |  |  |
Impairment loss |  | 10,684 | 304,163
Vessels, net | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value Measurements [Line Items] |  |  |
Impairment loss |  | 10,684 | 145,631
Advances for vessels under construction | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value Measurements [Line Items] |  |  |
Impairment loss |  |  | 158,532
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value Measurements [Line Items] |  |  |
Property, plant, and equipment, Fair value |  | 12,700 | 295,927
Significant Other Observable Inputs (Level 2) | Vessels, net | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value Measurements [Line Items] |  |  |
Property, plant, and equipment, Fair value |  | $ 12,700 | 259,775
Significant Other Observable Inputs (Level 2) | Advances for vessels under construction | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value Measurements [Line Items] |  |  |
Property, plant, and equipment, Fair value |  |  | $ 36,152

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: 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=98514028&loc=d3e3602-108585 + Details
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- Definition Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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