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Stockholders' Equity (Narrative) (Details) (USD $)
 0 Months Ended 12 Months Ended 1 Months Ended
May 22, 2014
Jan. 06, 2014
Jan. 06, 2014
Dec. 20, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Dividends paid per share   $ 2.00us-gaap_CommonStockDividendsPerShareCashPaid   $ 2.00us-gaap_CommonStockDividendsPerShareCashPaid        
Dividends paid       $ 45,000,000us-gaap_DividendsCommonStockCash        
Reduction in outstanding options exercise price     $ 2.00dw_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsOutstandingExercisePriceReduction          
Number of shares available for issuance following increase 1,678,632dw_SharebasedCompensationArrangementbySharebasedPaymentAwardIncreaseinMaximumSharesAuthorized              
Shares available for grant         1,389,506us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 246,368us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 688,712us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Amount of compensation exchanged for deferred stock units         2,000,000dw_CompensationExchangedForShareBasedAwards 100,000dw_CompensationExchangedForShareBasedAwards 200,000dw_CompensationExchangedForShareBasedAwards  
Minimum percentage stock option exercise price must be equal to fair market value         100.00%dw_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisePriceAsPercentageOfFairMarketValue      
Minimum holding period of common stock         6 months      
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options         293,860us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 303,240us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 426,788us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award exercise period         10 years      
Deferred Stock Units, Restricted Stock and Stock Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Deferred stock units, per share   $ 2.00us-gaap_DeferredCompensationArrangementWithIndividualExercisePrice
/ us-gaap_AwardTypeAxis
= dw_DeferredStockUnitsRestrictedStockandStockAwardsMember		            
Value of stock issued during period   1,800,000us-gaap_StockIssuedDuringPeriodValueStockDividend
/ us-gaap_AwardTypeAxis
= dw_DeferredStockUnitsRestrictedStockandStockAwardsMember		   1,400,000us-gaap_StockIssuedDuringPeriodValueStockDividend
/ us-gaap_AwardTypeAxis
= dw_DeferredStockUnitsRestrictedStockandStockAwardsMember		        
Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expiration period of stock options         6 years      
Vesting period         5 years      
Unvested stock options, unrecognized compensation costs         1,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		      
Unrecognized compensation costs, weighted-average recognition period         1 year 4 months 0 days      
Deferred Stock Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation costs, weighted-average recognition period         2 years 0 months 0 days      
Unrecognized compensation costs         13,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= dw_DeferredStockUnitMember		      
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation costs, weighted-average recognition period         10 months 24 days      
Unrecognized compensation costs         800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		      
Stock Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation costs, weighted-average recognition period         1 year 4 months 0 days      
Unrecognized compensation costs         4,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= dw_StockAwardsMember		      
Stock awards, performance period         3 years      
Stock Awards [Member] | Executive Officers [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for grant         85,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= dw_StockAwardsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
Number of executive officers entitled to long-term awards         2dw_EmployeeServiceShareBasedCompensationNonvestedAwardsNumberofOfficers
/ us-gaap_AwardTypeAxis
= dw_StockAwardsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
Stock Awards [Member] | Other Officers [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for grant         18,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= dw_StockAwardsMember
/ us-gaap_TitleOfIndividualAxis
= dw_OtherOfficersMember		      
Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Payments of Dividends   46,700,000us-gaap_PaymentsOfDividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		            
Subsequent event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Deferred stock units, value               $ 2,000,000us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember