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Shareholders' Equity Shareholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Issuance of common shares $ 4,882us-gaap_ProceedsFromIssuanceOfCommonStock $ 23,783us-gaap_ProceedsFromIssuanceOfCommonStock
At-the-market equity issuance [Member]    
Stock Issued During Period, Shares, New Issues 233,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ dre_StockIssueProceedsAxis
= dre_AtTheMarketEquityIssuanceMember		  
Issuance of common shares 4,900us-gaap_ProceedsFromIssuanceOfCommonStock
/ dre_StockIssueProceedsAxis
= dre_AtTheMarketEquityIssuanceMember		  
At-the-market equity issuance [Member] | Gross Proceeds [Member]    
Issuance of common shares $ 5,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dre_EquityProceedsAxis
= dre_GrossProceedsMember
/ dre_StockIssueProceedsAxis
= dre_AtTheMarketEquityIssuanceMember