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Advances for vessels under construction and acquisition of vessels, Newbuildings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Vessels [Line Items]
Aggregate reduction of the purchase price of certain of the newbuilding vessels	$ 64,508
Newbuilding Vessels or Lease Agreements
Vessels [Line Items]
Capital expenditures deferred	$ 187,695
Number of contracts for Newbuildings acquired	19
Total aggregate remaining contracted price plus agreed additional amounts	$ 619,223
Newbuildings periodic installments, next twelve months	431,527
Newbuildings periodic installments, 2017	113,366
Newbuildings periodic installments, 2018	$ 74,330
Merger and Pappas Transaction
Vessels [Line Items]
Number of contracts for Newbuildings acquired	11
Financed through bareboat capital lease arrangements | Newbuilding Vessels or Lease Agreements
Vessels [Line Items]
Newbuildings periodic installments, next twelve months	$ 84,600
Newbuildings periodic installments, 2017	77,100
Newbuildings periodic installments, 2018	$ 38,400

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- Definition

The aggregate reduction of the purchase price of vessels under construction.

+ References

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- Definition

The number of newbuildings contracts acquired.

+ References

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- Definition

The total amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation to be paid within and after one year from the balance sheet date.

+ References

No definition available.

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- Definition

The carrying amount of deferred costs.

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

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