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Summary of Significant Accounting Policies (Computation of Dividends Paid Deduction) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Cash dividends paid $ 255,622dre_TaxDisclosureTaxDividendsPaid $ 251,914dre_TaxDisclosureTaxDividendsPaid $ 228,330dre_TaxDisclosureTaxDividendsPaid
Less: Return of capital (3,622)dre_ReturnOfCapital (1,938)dre_ReturnOfCapital (152,670)dre_ReturnOfCapital
Dividends Paid Deduction 252,000dre_DividendsPaidDeduction 249,976dre_DividendsPaidDeduction 75,660dre_DividendsPaidDeduction
Less: Capital gain distributions (98,267)dre_CapitalGains (109,133)dre_CapitalGains 0dre_CapitalGains
Total dividends paid deduction attributable to adjusted taxable income $ 153,733dre_TotalDividendsPaidDeductionAttributableToAdjustedTaxableIncome $ 140,843dre_TotalDividendsPaidDeductionAttributableToAdjustedTaxableIncome $ 75,660dre_TotalDividendsPaidDeductionAttributableToAdjustedTaxableIncome