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Subsequent Events Terminated Swaps (Details) (Subsequent Event [Member], USD $) | 1 Months Ended
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Nov. 08, 2013
Subsequent Event [Member] |
Subsequent Event [Line Items] |
Terminated derivative instruments | $ 902,000

X
- Definition Notional amount of derivative instruments terminated during the period. + References No definition available. + Details
Name: | dx_Terminatedderivativeinstruments
Namespace Prefix: | dx_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration