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Fair value measurements - Fair value on a nonrecurring basis (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

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- Definition

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+ References

No definition available.

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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

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