Annual report pursuant to Section 13 and 15(d)

Fair Value Disclosures (Details)

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Fair Value Disclosures (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of long lived real estate assets      
Impairments $ 2,009 $ 15,324 $ 6,451
Real Estate [Member] | Level 3 [Member]
      
Summary of long lived real estate assets      
Adjusted Basis of Long-Lived Real Estate Assets 12,013 [1] 68,179 [1],[2]  
Impairments 2,009 15,324  
Initial Basis of Long-Lived Real Estate Assets 14,022 83,503  
Other Assets [Member] | Level 2 [Member]
      
Summary of long lived real estate assets      
Adjusted Basis of Long-Lived Real Estate Assets   952  
Impairments   848  
Initial Basis of Long-Lived Real Estate Assets   $ 1,800  
[1] The fair values in the table above represent only those real estate assets whose carrying values were adjusted in the respective period.
[2] The carrying values for these real-estate assets may have subsequently increased or decreased from the fair value reported due to activities that have occurred since the measurement date.