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Earnings per share, detail (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income / (loss) | $ 3,238 us-gaap_NetIncomeLoss | $ (57,346)us-gaap_NetIncomeLoss | $ 5,969 us-gaap_NetIncomeLoss
Weighted Average Number Of Share Outstanding Basic And Diluted | 51,645,071 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 33,159,328 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 26,934,533 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Earnings Per Share, Basic and Diluted | $ 0.06 us-gaap_EarningsPerShareBasicAndDiluted | $ (1.73)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.22 us-gaap_EarningsPerShareBasicAndDiluted
[EarningsLossPerShareBasicMember] |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income / (loss) | 3,238 us-gaap_NetIncomeLoss / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | (57,346)us-gaap_NetIncomeLoss / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | 5,969 us-gaap_NetIncomeLoss / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember
Distributed earnings allocated to restricted shares | (50)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | 0 us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | (104)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember
Net Income / (loss) Available to Common Stockholders | 3,188 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | (57,346)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | 5,865 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember
Weighted average number of common shares, basic | 51,645,071 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | 33,159,328 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | 26,934,533 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember
Effect of dilutive restricted shares | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember
Weighted average number of common shares, diluted | 51,645,071 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | 33,159,328 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | 26,934,533 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember
Earnings Per Share, Basic and Diluted | $ 0.06 us-gaap_EarningsPerShareBasicAndDiluted / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | $ (1.73)us-gaap_EarningsPerShareBasicAndDiluted / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember | $ 0.22 us-gaap_EarningsPerShareBasicAndDiluted / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareBasicMember
[EarningsLossPerShareDilutedMember] |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income / (loss) | 3,238 us-gaap_NetIncomeLoss / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | (57,346)us-gaap_NetIncomeLoss / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | 5,969 us-gaap_NetIncomeLoss / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember
Distributed earnings allocated to restricted shares | (50)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | 0 us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | (104)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember
Net Income (Loss) Available to Common Stockholders, Diluted | $ 3,188 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | $ (57,346)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | $ 5,865 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember
Weighted average number of common shares, basic | 51,645,071 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | 33,159,328 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | 26,934,533 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember
Effect of dilutive restricted shares | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember
Weighted average number of common shares, diluted | 51,645,071 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | 33,159,328 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | 26,934,533 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember
Earnings Per Share, Basic and Diluted | $ 0.06 us-gaap_EarningsPerShareBasicAndDiluted / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | $ (1.73)us-gaap_EarningsPerShareBasicAndDiluted / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember | $ 0.22 us-gaap_EarningsPerShareBasicAndDiluted / dcix_EffectsOfIncrementalSharesAxis = dcix_EarningsLossPerShareDilutedMember

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