Fair Value Measurements and Disclosures (Details 1) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Liabilities
Unamortized premium on Mortgage loan	$ 475,820	$ 313,009
Exchangeable notes	303,374	299,964
Unsecured senior notes	655,929	655,803
Outstanding borrowings	245,000	159,000
Carrying Value [Member]
Liabilities
Unamortized premium on Mortgage loan	475,820	313,009
Exchangeable notes	303,374	299,964
Unsecured senior notes	655,929	655,803
Outstanding borrowings	245,000	159,000
Fair Value [Member]
Liabilities
Unamortized premium on Mortgage loan	493,185	329,456
Exchangeable notes	324,322	312,598
Unsecured senior notes	705,220	661,644
Outstanding borrowings	$ 244,757	$ 159,659

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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