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Prepaid charter revenue, detail (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Deferred asset from varying charter rates $ 0dcix_PrepaidCharterRevenueFromVaryingCharterRates $ 192dcix_PrepaidCharterRevenueFromVaryingCharterRates  
Prepaid charter revenue from time-charter attached 6,364us-gaap_FiniteLivedIntangibleAssetsNet 17,974us-gaap_FiniteLivedIntangibleAssetsNet 29,796us-gaap_FiniteLivedIntangibleAssetsNet
Prepaid charter revenue, total $ 6,364dcix_PrepaidCharterRevenueTotal $ 18,166dcix_PrepaidCharterRevenueTotal