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Significant Acquisitions and Dispositions (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Other 2010 Acquisitions [Member]
buildings
Dec. 31, 2011
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2012
Other Two Thousand Twelve Acquisitions [Member] [Domain]
buildings
Dec. 31, 2011
Premier Portfolio [Member]
buildings
Dec. 31, 2010
Premier Portfolio [Member]
buildings
Jul. 01, 2010
Dugan Realty [Member]
sqft
A
buildings
Jul. 01, 2010
Secured Loan Maturing in October Two Thousand Ten [Member]
Jul. 01, 2010
Secured Loan Maturing in October Two Thousand Twelve [Member]
Dec. 31, 2011
Office [Member]
Premier Portfolio [Member]
buildings
Dec. 31, 2010
Office [Member]
Premier Portfolio [Member]
buildings
Dec. 31, 2011
Industrial [Member]
Premier Portfolio [Member]
buildings
Dec. 31, 2010
Industrial [Member]
Premier Portfolio [Member]
buildings
Dec. 31, 2012
Medical Office [Member]
Other Two Thousand Twelve Acquisitions [Member] [Domain]
buildings
Dec. 31, 2011
Indianapolis Indiana [Member]
Office [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2011
Indianapolis Indiana [Member]
Industrial [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2010
Houston Texas [Member]
Industrial [Member]
Other 2010 Acquisitions [Member]
buildings
Dec. 31, 2012
Houston Texas [Member]
Industrial [Member]
Other Two Thousand Twelve Acquisitions [Member] [Domain]
buildings
Dec. 31, 2010
South Florida [Member]
Office [Member]
Other 2010 Acquisitions [Member]
buildings
Dec. 31, 2010
South Florida [Member]
Industrial [Member]
Other 2010 Acquisitions [Member]
buildings
Dec. 31, 2011
Atlanta Georgia [Member]
Office [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2012
Atlanta Georgia [Member]
Industrial [Member]
Other Two Thousand Twelve Acquisitions [Member] [Domain]
buildings
Dec. 31, 2010
Chicago Illinois [Member]
Industrial [Member]
Other 2010 Acquisitions [Member]
buildings
Dec. 31, 2011
Chicago Illinois [Member]
Industrial [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2012
Chicago Illinois [Member]
Industrial [Member]
Other Two Thousand Twelve Acquisitions [Member] [Domain]
buildings
Dec. 31, 2010
Phoenix Arizona [Member]
Industrial [Member]
Other 2010 Acquisitions [Member]
buildings
Dec. 31, 2011
Phoenix Arizona [Member]
236210 Industrial Building Construction [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2011
Savannah Georgia [Member]
236210 Industrial Building Construction [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2010
Nashville Tennessee [Member]
Industrial [Member]
Other 2010 Acquisitions [Member]
buildings
Dec. 31, 2011
Minneapolis, Minnesota [Member]
Industrial [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2011
Medical Office [Member]
buildings
Dec. 31, 2010
Columbus Ohio [Member]
Industrial [Member]
Other 2010 Acquisitions [Member]
buildings
Dec. 31, 2012
Columbus Ohio [Member]
Industrial [Member]
Other Two Thousand Twelve Acquisitions [Member] [Domain]
buildings
Dec. 31, 2011
Southern California [Member]
Industrial [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2012
Southern California [Member]
Industrial [Member]
Other Two Thousand Twelve Acquisitions [Member] [Domain]
buildings
Dec. 31, 2012
Northern California [Member] [Member]
Industrial [Member]
Other Two Thousand Twelve Acquisitions [Member] [Domain]
buildings
Dec. 31, 2010
Charlotte North Carolina [Member]
Medical Office [Member]
Other 2010 Acquisitions [Member]
buildings
Dec. 31, 2011
Raleigh North Carolina [Member]
Office [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2011
Raleigh North Carolina [Member]
Industrial [Member]
Other 2011 Acquisitions [Member]
buildings
Dec. 31, 2011
Dallas Texas [Member]
Industrial [Member]
Other 2011 Acquisitions [Member]
buildings
Business Acquisition [Line Items]                                                                                    
Proceeds from Sale of Real Estate Held-for-investment $ 138,118,000 $ 1,572,093,000 $ 499,520,000                                                                              
Debt Instrument, Face Amount             124,400,000     195,400,000 87,600,000                                                              
Limited Partners' Capital Account, Units Issued             2,100,000                                                                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life         6 years 8 months 9 days 8 years 10 months 3 years 6 months                                                                      
Cash consideration paid for acquisition             27,400,000                                                                      
Noncontrolling Interest, Increase from Business Combination             28,400,000                                                                      
Business Combination, Acquisition Related Costs 4,200,000 2,300,000 1,900,000                                                                              
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage                 50.00%                                                                  
Cash Acquired from Acquisition                 28,100,000                                                                  
Payments to Acquire Businesses and Interest in Affiliates                 166,700,000                                                                  
Payments to Acquire Businesses, Net of Cash Acquired                 $ 138,600,000                                                                  
Acres of Land Acquired                 63                                                                  
Number Of Real Estate Properties Acquired       13 43 37 55 39 106     4 1 12 38 27 1 1 3 1 2 2 1 1 2 12 3 1 1 1 1 3 11 1 2 2 1 2 1 1 6 3
Square Footage Of Real Estate Properties Acquired Or Disposed                 20,800,000