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Basis of Presentation and General Information - The Excel Transactions (Details) $ in Thousands	8 Months Ended	12 Months Ended
	Aug. 19, 2014 USD ($) shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares
Vessels [Line Items]
Payments to acquire property plant and equipment		$ 396,154	$ 473,917	$ 518,447
Excel Vessels
Vessels [Line Items]
Number of vessels acquired	34
Payments to acquire property plant and equipment	$ 288,391		$ 39,475	$ 248,751
Shares to acquire vessels | shares	5,983,462		851,577	5,131,885
Capesize vessels
Vessels [Line Items]
Number of vessels acquired	6
Kamsarmax vessels
Vessels [Line Items]
Number of vessels acquired	14
Panamax vessels
Vessels [Line Items]
Number of vessels acquired	12
Handymax vessels
Vessels [Line Items]
Number of vessels acquired	2
Excel Vessel Bridge Facility
Vessels [Line Items]
Maximum borrowing capacity		$ 231,000

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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