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Real Estate Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Assets:    
Gross historical cost $ 347,662 $ 258,079 [1]
Accumulated amortization (91,591) (49,145)
Net book value 256,071 208,934
Weighted-average amortization period in years 17.2 18.2
Liabilities:    
Gross historical cost 62,715 62,281
Accumulated amortization (18,523) (15,992)
Net book value 44,192 46,289
Weighted-average amortization period in years 12.5 14.0
In place lease intangibles [Member]
   
Assets:    
Gross historical cost 269,915 182,030
Above market tenant leases [Member]
   
Assets:    
Gross historical cost 24,480 24,089
Below market ground leases [Member]
   
Assets:    
Gross historical cost 46,992 46,992
Lease commissions [Member]
   
Assets:    
Gross historical cost 6,275 4,968
Below market tenant leases [Member]
   
Liabilities:    
Gross historical cost 57,695 57,261
Above market ground leases [Member]
   
Liabilities:    
Gross historical cost $ 5,020 $ 5,020
[1] NOTE: The consolidated balance sheet at December 31, 2010 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.