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Fair Value Measurements and Disclosures (Details 1) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Liabilities  
Secured Debt$ 473,997$ 313,009
Exchangeable notes305,115299,964
Unsecured senior notes980,487655,803
Credit Facility0159,000
Carrying Value [Member]
  
Liabilities  
Secured Debt473,997313,009
Exchangeable notes305,115299,964
Unsecured senior notes980,487655,803
Credit Facility0[1]159,000
Fair Value [Member]
  
Liabilities  
Secured Debt487,807329,456
Exchangeable notes321,183312,598
Unsecured senior notes1,014,863661,644
Credit Facility$ 0$ 159,659
[1]As of September 30, 2011, there were no outstanding borrowings on the Credit Facility.