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Real Estate Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended12 Months Ended
Sep. 30, 2011
Year
Property
State
Dec. 31, 2010
Year
Assets:  
Gross historical cost$ 361,832$ 258,079[1]
Accumulated amortization(121,012)(49,145)
Net book value240,820208,934
Weighted-average amortization period in years18.618.2
Liabilities:  
Gross historical cost69,69162,281
Accumulated amortization(19,964)(15,992)
Net book value49,72746,289
Weighted-average amortization period in years12.214.0
In place lease intangibles [Member]
  
Assets:  
Gross historical cost279,081182,030
Above market tenant leases [Member]
  
Assets:  
Gross historical cost24,88224,089
Below market ground leases [Member]
  
Assets:  
Gross historical cost49,97746,992
Lease commissions [Member]
  
Assets:  
Gross historical cost7,8924,968
Below market tenant leases [Member]
  
Liabilities:  
Gross historical cost64,67157,261
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.