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v2.4.1.9

Shareholders' Equity (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 25.00us-gaap_PreferredStockLiquidationPreference |  |
Shareholders' Equity, Common Stock [Roll Forward] |  |  |
Balance as of beginning of period | 54,739,111us-gaap_CommonStockSharesOutstanding | 54,310,484us-gaap_CommonStockSharesOutstanding |
Common stock issued under DRIP | 4,744us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan | 3,938us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan |
Common stock issued or redeemed under stock and incentive Plans | 231,274.000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation | 442,035us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation |
Common stock forfeited for tax withholding on share-based compensation | (65,913)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | (59,150)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation |
Stock Repurchased During Period, Shares | (16,140)us-gaap_StockRepurchasedDuringPeriodShares | 0us-gaap_StockRepurchasedDuringPeriodShares |
Balance as of end of period | 54,893,076us-gaap_CommonStockSharesOutstanding | 54,697,307us-gaap_CommonStockSharesOutstanding |
Dividend reinvestment plan, shares authorized | 3,000,000dx_DividendReinvestmentPlanSharesAuthorized |  |
Stock issued during period, remaining shares available, dividend reinvestment plan | 2,445,401dx_StockIssuedDuringPeriodRemainingSharesAvailableDividendReinvestmentPlan |  |
Dividends declared per common share | $ 0.24us-gaap_CommonStockDividendsPerShareDeclared |  |
Stock Repurchase Program, Authorized Amount | $ 50,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |
Stock Repurchase Program Expiration Date | Dec. 31, 2016 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 49,868,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |
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 | 2,300,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | 2,300,000us-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 | 2,250,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 2,250,000us-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 | 7,416,520dx_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 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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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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