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Repurchase Agreements Repurchase Agreements, Term to Original Maturity (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 3,013,110 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount | $ 3,580,754 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount
Deferred Costs | 0 us-gaap_DeferredFinanceCostsNoncurrentNet | (243)us-gaap_DeferredFinanceCostsNoncurrentNet
Less than 30 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | 250,635 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_Lessthan30daysMember | 4,736 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_Lessthan30daysMember
30 to 90 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | 617,399 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_A30to90daysMember | 1,176,631 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_A30to90daysMember
91 to 180 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | 904,830 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_A91to180daysMember | 1,439,225 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_A91to180daysMember
6 months to 1 year [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | 1,030,569 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_A6monthsto1yearMember | 960,405 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_A6monthsto1yearMember
1 year or longer [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount | $ 209,677 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_A1yearorlongerMember | $ 0 us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = dx_A1yearorlongerMember

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- Definition Net amount of long-term deferred finance costs capitalized at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729 + Details
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