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Fair Value Measurements (Details 2) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Carrying Amount [Member]
   
Assets    
Loans Receivable, Fair Value Disclosure $ 112,987 $ 88,937
Liabilities    
Debt 1,711,038 1,774,985
Fair Value [Member]
   
Assets    
Loans Receivable, Fair Value Disclosure 99,271 75,868
Liabilities    
Debt $ 1,608,218 $ 1,614,626