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Capital Leased Assets and Capital Lease Obligations (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Finance leased assets [Abstract]: |  |  |
Vessel's sale and leaseback price | $ 85,572 |  |
Prepaid lease rentals | $ 45,793 |  | $ 49,817
Net settlements of interest rate swaps qualifying for cash flow hedge |  | $ 6,604 |
Capital leased assets | $ 256,716 |  |
Capital leased assets, depreciation | 3,759 | 2,347 |
Capital leased assets, net | 246,788 |  | $ 250,547
Finance lease obligation [Abstract]: |  |  |
Finance lease obligations, Gross | $ 240,528 |  |
Finance lease obligation maturity | 2024 |  |
Interest expense incurred on finance leases | $ 8,615 | $ 5,803 |

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

X
- Definition Total capital lease obligation remaining balance as at the reporting period end, excluding any interest. + References No definition available. + Details
Name: | cmre_CapitalLeaseObligationsRemainingBalance
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | cmre_FinanceLeaseObligationAbstract
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The year the capital lease obligations mature. + References No definition available. + Details
Name: | cmre_FinanceLeaseObligationMaturity
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | cmre_FinanceLeasedAssetsAbstract
Namespace Prefix: | cmre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References No definition available. + Details
Name: | cmre_FinanceLeasedAssetsNet
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Interest expense incurred on finance leases during the reporting period and is included in the income statement. + References No definition available. + Details
Name: | cmre_InterestExpenseIncurredOnFinanceLeases
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount before depreciation/ amortization of the difference between the fair value of the asset sold and the carrying amount of the asset, when the fair value of the asset sold is more than its carrying amount and the amount of net settlement of interest rate swaps qualifying for cash flow hedge that has been reclassified as prepaid lease rentals. The prepaid lease rental is amortizing over the lease term. + References No definition available. + Details
Name: | cmre_PrepaidLeaseRentalsGross
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The per vessel price for the 3 vessels (MSC Azov, MSC Ajaccio and MSC Amalfi), due to the sale and leaseback transaction. + References No definition available. + Details
Name: | cmre_VesselsSaleAndLeasebackPrice
Namespace Prefix: | cmre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The expense charged against earnings for the periodic recognition of capitalized leases. This element may apply to energy companies that lease mineral producing properties and to other enterprises that capitalize property, plant, or equipment obtained through capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45031-112735 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=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_AmortizationOfLeasedAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
Name: | us-gaap_CapitalLeasedAssetsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant