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v2.4.1.9

Shareholders' Equity (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 25.00 us-gaap_PreferredStockLiquidationPreference |  |  |  |  |  |  |  | $ 25.00 us-gaap_PreferredStockLiquidationPreference |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  | 54,310,484 us-gaap_CommonStockSharesOutstanding |  |  |  | 54,268,915 us-gaap_CommonStockSharesOutstanding |  | 54,310,484 us-gaap_CommonStockSharesOutstanding | 54,268,915 us-gaap_CommonStockSharesOutstanding
Common stock issued under DRIP |  |  |  |  |  |  |  |  | 16,753 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan | 515,257 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Common stock issued or redeemed under stock and incentive Plans |  |  |  |  |  |  |  |  | 471,210.00 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation | 270,158 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Common stock forfeited for tax withholding on share-based compensation |  |  |  |  |  |  |  |  | (59,336)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | (52,385)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Balance as of end of period | 54,739,111 us-gaap_CommonStockSharesOutstanding |  |  | 54,310,484 us-gaap_CommonStockSharesOutstanding |  |  |  |  | 54,739,111 us-gaap_CommonStockSharesOutstanding | 54,310,484 us-gaap_CommonStockSharesOutstanding
Dividend reinvestment plan, shares authorized | 3,000,000 dx_DividendReinvestmentPlanSharesAuthorized |  |  |  |  |  |  |  | 3,000,000 dx_DividendReinvestmentPlanSharesAuthorized |
Stock issued during period, remaining shares available, dividend reinvestment plan | 2,450,145 dx_StockIssuedDuringPeriodRemainingSharesAvailableDividendReinvestmentPlan |  |  |  |  |  |  |  | 2,450,145 dx_StockIssuedDuringPeriodRemainingSharesAvailableDividendReinvestmentPlan |
Dividends declared per common share | $ 0.25 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.25 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.25 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.27 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.27 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.29 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.29 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.25 us-gaap_CommonStockDividendsPerShareDeclared |  |
Stock Repurchase Program, Authorized Amount | $ 50,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  |  |  |  |  |  | $ 50,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |
Stock Repurchased During Period, Shares |  |  |  |  |  |  |  |  | 0 us-gaap_StockRepurchasedDuringPeriodShares | (872,447)us-gaap_StockRepurchasedDuringPeriodShares
At the market progam [Member] |  |  |  |  |  |  |  |  |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |
Common stock issued under ATM program |  |  |  |  |  |  |  |  | 0 us-gaap_StockIssuedDuringPeriodSharesNewIssues / dx_EquityIssuanceTypeAxis = dx_AtMarketProgamAtmMember | 180,986 us-gaap_StockIssuedDuringPeriodSharesNewIssues / dx_EquityIssuanceTypeAxis = dx_AtMarketProgamAtmMember
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  | 8.50%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
Preferred Stock, Shares Issued | 2,300,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  | 2,300,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  | 2,300,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 2,300,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  | 7.625%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Preferred Stock, Shares Issued | 2,250,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | 2,250,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  | 2,250,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 2,250,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Common Stock [Member] | At the market progam [Member] |  |  |  |  |  |  |  |  |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |  |  |  |  |  |  |  |
ATM program, authorized shares remaining | 7,416,520 dx_EquityPlacementProgramAuthorizedSharesRemaining / dx_EquityIssuanceTypeAxis = dx_AtMarketProgamAtmMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  | 7,416,520 dx_EquityPlacementProgramAuthorizedSharesRemaining / dx_EquityIssuanceTypeAxis = dx_AtMarketProgamAtmMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |

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- Definition Maximum number of shares authorized for issuance under the Company's dividend reinvestment plan (DRIP). + References No definition available. + Details
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- Definition Of the common shares authorized to be issued by the Company's sales agent under its equity placement program, item represents the number of common shares remaining available for the Company to offer sell through its sales agent under the program. + References No definition available. + Details
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- Definition Number of shares remaining available for issuance under the dividend reinvestment plan. + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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