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Consolidated Statements of Shareholders' Equity Statement (USD $) In Thousands | Total | Preferred Stock Including Additional Paid in Capital [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | Retained Earnings [Member] | Shareholders' Equity [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Total shareholders' equity, beginning balance at Dec. 31, 2012 |  |  |  |  |  |  |
Stock issuance |  |  | $ 7 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 7,548 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Granting and vesting of restricted stock |  |  | 3 dx_Grantingandvestingofrestrictedstock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,376 dx_Grantingandvestingofrestrictedstock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Amortization of stock issuance costs |  |  |  | (119)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Adjustments for tax withholding on share-based compensation |  |  | (1)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (545)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net income (loss) | 68,069 us-gaap_ProfitLoss |  |  |  |  |  |
Other comprehensive (loss) income | (86,327)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  |  |
Total shareholders' equity, ending balance at Dec. 31, 2013 | 585,876 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember | 404 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 634,683 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (3,255)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (260,483)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 371,349 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember
Stock issuance |  | 0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember | 1 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 251 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 252 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember
Granting and vesting of restricted stock |  |  | 4 dx_Grantingandvestingofrestrictedstock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,715 dx_Grantingandvestingofrestrictedstock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 2,719 dx_Grantingandvestingofrestrictedstock / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember
Amortization of stock issuance costs |  |  |  | (75)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (75)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember
Adjustments for tax withholding on share-based compensation |  |  | (1)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (506)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (507)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember
Net income (loss) | 27,806 us-gaap_ProfitLoss |  |  |  |  | 27,806 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 27,806 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember
Dividends on preferred stock |  |  |  |  |  | (9,176)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (9,176)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember
Dividends on common stock |  |  |  |  |  | (54,725)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (54,725)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember
Other comprehensive (loss) income | 55,132 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 55,132 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 55,132 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember
Total shareholders' equity, ending balance at Dec. 31, 2014 | $ 607,302 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 109,658 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember | $ 547 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 763,935 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 21,316 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (288,154)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 607,302 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ShareholdersEquityMember

X
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