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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Abstract] |  |  |
REIT taxable income | $ 23,334 | $ 21,085 | $ 21,332

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- Definition Income Taxes [Abstract] + References No definition available. + Details
Name: | dx_IncomeTaxesAbstract
Namespace Prefix: | dx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Estimated REIT taxable income before consideration of any carryforwards or required dividend distributions. + References No definition available. + Details
Name: | dx_REITtaxableincome
Namespace Prefix: | dx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration