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Repurchase Agreements Counterparty Information (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 Agreements
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Counterparty Information [Line Items] |
Number of Counterparties with Borrowings Outstanding | 19
Available Repurchase Agreement Counterparties | 28
Concentration Risk, Percentage | 18.00%
Amount outstanding with counterparty | $ 366,130
Weighted average interest rate, amount outstanding with counterparty | 1.35%

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- Definition Amount represents the total debt outstanding with a particular counterparty when the amount of equity at risk with that counterparty exceeds 10% of the Company's shareholders' equity. + References No definition available. + Details
Name: | dx_AmountOutstandingWithCounterparty
Namespace Prefix: | dx_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Assets Sold Under Agreements to Repurchase, Number of Agreement Borrowings Available + References No definition available. + Details
Name: | dx_AssetsSoldUnderAgreementsToRepurchaseNumberOfAgreementBorrowingsAvailable
Namespace Prefix: | dx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Agreement Borrowings Outstanding held by the entity. + References No definition available. + Details
Name: | dx_AssetsSoldUnderAgreementsToRepurchaseNumberOfAgreementBorrowingsOutstanding
Namespace Prefix: | dx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | dx_CounterpartyInformationLineItems
Namespace Prefix: | dx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of equity at risk under all repurchase agreements with a particular counterparty where equity at risk is defined as the excess of carrying amount (or market value, if higher than the carrying amount) of the securities or other assets pledged as collateral to secure the repurchase agreement borrowings over the amount of the repurchase liability outstanding. + References No definition available. + Details
Name: | dx_RepurchaseAgreementCounterpartyPercentOfEquityAtRisk
Namespace Prefix: | dx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average interest rate on all amounts outstanding with a particular counterparty for whom the amount of equity at risk exceeds 10% of the Company's shareholder's equity. + References No definition available. + Details
Name: | dx_WeightedAverageInterestRateAmountOutstandingWithCounterparty
Namespace Prefix: | dx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant