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Comprehensive Income (Loss)-Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Comprehensive Income (Loss) Disclosure [Abstract] |  |
Other comprehensive income / (loss) for the period | $ 2,254 | $ 18,900
Comprehensive income (loss) | 72,867 | 66,113
Interest rate swaps | (15,574) | (8,862)
Reclassification to Net Income | $ 17,777 | 21,596
Net settlements on interest rate swaps qualifying for cash flow hedge |  | (489)
Amounts reclassified from Net settlements on interest rate swaps qualifying for hedge accounting to Depreciation | $ (51) | (51)
Amounts reclassified from Net settlements on interest rate swaps qualifying for hedge accounting to Prepaid lease rentals |  | $ (6,604)

X
- Definition This element represents the amounts reclassified from Net settlements on interest rate swaps qualifying for hedge accounting to Depreciation + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amounts reclassified from Net settlements on interest rate swaps qualifying for hedge accounting to Prepaid lease rentals + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition This element represents the amount of change in fair value and the interest paid during the reporting period, for derivative instruments designated and qualifying as the effective portion for cash flow hedges. + References No definition available. + Details
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- Definition The net settlements on interest rate swaps qualifying for cash flow hedge + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents the interest paid reclassified from accumulated other comprehensive income into net income on derivative instruments designated and qualifying as hedging instruments + References No definition available. + Details
Name: | cmre_ReclassificationOnInterestPaidOfDerivativesQualifyingAsHedges
Namespace Prefix: | cmre_
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Balance Type: | debit
Period Type: | duration

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581 + Details
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