Fair Value Measurements and Hedging - Derivative instruments effect on statement of operations (Table) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Interest and finance costs
Reclassification adjustments of interest rate swap loss/(gain) transferred to Interest and finance costs from Other comprehensive income/(loss) (Note 7)	$ (998)	$ 492
Total Gain/(loss) recognized	(998)	492
Gain/(loss) on forward freight agreements and bunker swaps, net
Total Gain/(loss) recognized	(1,537)	19,532
Forward Freight Agreements [Member]
Gain/(loss) on forward freight agreements and bunker swaps, net
Realized gain/(loss) on forward freight agreements and freight options	(39)	11,635
Unrealized gain/(loss) on forward freight agreements and freight options	(1,560)	(12,555)
Bunker Swaps [Member]
Gain/(loss) on forward freight agreements and bunker swaps, net
Realized gain/(loss) on bunker swaps	58	7,957
Unrealized gain/(loss) on bunker swaps	$ 4	$ 12,495

The aggregate net effect in earnings due to derivatives.

No definition available.

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- Definition

The realized gain / (loss) of bunker swaps agreements, held at each balance sheet date, that was included in earnings for the period.

+ References

No definition available.

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The realized gain / (loss) of forward freight agreements, held at each balance sheet date, that was included in earnings for the period.

+ References

No definition available.

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- Definition

The net change in the difference between the fair value, of bunker swaps, held at each balance sheet date, that was included in earnings for the period.

+ References

No definition available.

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The net change in the difference between the fair value, of forward freight agreements, held at each balance sheet date, that was included in earnings for the period.

+ References

No definition available.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

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- Definition

The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 815
-SubTopic 10
-Section 50
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