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Consolidated Statements Of Changes In Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income | Cumulative Earnings | Cumulative Distributions to Stockholders
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2011 | $ 892,584 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 786 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,697,979 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (13,151)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 501,283 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (1,294,313)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember
Beginning balance (in shares) at Dec. 31, 2011 |  | 78,555,908 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net income | 131,769 us-gaap_NetIncomeLoss |  |  |  | 131,769 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income | 151,483 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  | 151,483 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Issuance of common stock: |  |  |  |  |  |
Dividend reinvestment & stock purchase plans (in shares) |  | 2,741,168 rwt_StockIssuedDuringPeriodSharesDividendReinvestmentAndStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Dividend reinvestment & stock purchase plans | 38,580 rwt_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan | 28 rwt_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 38,552 rwt_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Employee stock purchase and incentive plans (in shares) |  | 419,340 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Employee stock purchase and incentive plans | (1,816)us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan | 3 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,819)us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Non-cash equity award compensation | 9,842 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 9,842 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Common dividends declared | (82,278)us-gaap_DividendsCommonStock |  |  |  |  | (82,278)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember
Ending balance at Dec. 31, 2012 | 1,140,164 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 817 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,744,554 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 138,332 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 633,052 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,376,591)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember
Ending balance (in shares) at Dec. 31, 2012 |  | 81,716,416 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net income | 173,246 us-gaap_NetIncomeLoss |  |  |  | 173,246 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income | 10,434 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  | 10,434 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Issuance of common stock: |  |  |  |  |  |
Dividend reinvestment & stock purchase plans (in shares) |  | 431,679 rwt_StockIssuedDuringPeriodSharesDividendReinvestmentAndStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Dividend reinvestment & stock purchase plans | 8,148 rwt_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan | 4 rwt_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8,144 rwt_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Employee stock purchase and incentive plans (in shares) |  | 356,706 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Employee stock purchase and incentive plans | (5,342)us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan | 4 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (5,346)us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Non-cash equity award compensation | 13,547 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 13,547 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Common dividends declared | (94,414)us-gaap_DividendsCommonStock |  |  |  |  | (94,414)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember
Ending balance at Dec. 31, 2013 | 1,245,783 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 825 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,760,899 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 148,766 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 806,298 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,471,005)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember
Ending balance (in shares) at Dec. 31, 2013 |  | 82,504,801 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Net income | 100,569 us-gaap_NetIncomeLoss |  |  |  | 100,569 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income | (8,078)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  | (8,078)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Issuance of common stock: |  |  |  |  |  |
Dividend reinvestment & stock purchase plans (in shares) |  | 488,174 rwt_StockIssuedDuringPeriodSharesDividendReinvestmentAndStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Dividend reinvestment & stock purchase plans | 9,017 rwt_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan | 5 rwt_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,012 rwt_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Employee stock purchase and incentive plans (in shares) |  | 450,166 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Employee stock purchase and incentive plans | (7,148)us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan | 4 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (7,152)us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Non-cash equity award compensation | 11,271 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 11,271 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Common dividends declared | (95,273)us-gaap_DividendsCommonStock |  |  |  |  | (95,273)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember
Ending balance at Dec. 31, 2014 | $ 1,256,141 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 834 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,774,030 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 140,688 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 906,867 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (1,566,278)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember
Ending balance (in shares) at Dec. 31, 2014 |  | 83,443,141 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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