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Fair Value Measurements and Disclosures (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Liabilities    
Secured Debt $ 350,219 $ 351,825
Exchangeable notes 308,689 306,892
Unsecured debt 1,130,651 980,569
Credit Facility 0 182,000
7.80% Series E and 7.50% Series F Cumulative Redeemable Preferred stock, called for redemption (Note 7) 126,500 0
Carrying Value [Member]
   
Liabilities    
Secured Debt 350,219 351,825
Exchangeable notes 308,689 306,892
Unsecured debt 1,130,651 980,569
Credit Facility 0 182,000
7.80% Series E and 7.50% Series F Cumulative Redeemable Preferred stock, called for redemption (Note 7) 126,500 0
Fair Value [Member]
   
Liabilities    
Secured Debt 367,287 [1] 367,402 [1]
Exchangeable notes 326,842 [1] 320,919 [1]
Unsecured debt 1,215,425 [2] 1,011,982 [2]
Credit Facility 0 [1] 182,299 [1]
7.80% Series E and 7.50% Series F Cumulative Redeemable Preferred stock, called for redemption (Note 7) 126,500 [3] 0 [3]
Fair Value (Level 2) [Member] | Carrying Value [Member]
   
Liabilities    
Unsecured debt 233,000 83,000
Fair Value (Level 2) [Member] | Fair Value [Member]
   
Liabilities    
Unsecured debt $ 240,600 $ 88,900
[1] Fair value calculated using Level II inputs which are based on model−derived valuations in which significant inputs and significant value drivers are observable in active markets.
[2] Fair value calculated primarily using Level I inputs which are based on quoted prices for identical instruments in active markets. The fair value of the Series B unsecured senior notes and the Unsecured Term Loan Facility are calculated using Level II inputs which are based on model−derived valuations in which significant inputs and significant value drivers are observable in active markets. The carrying value and fair value of these Level II instruments is $233.0 million and $240.6 million, respectively, as of March 31, 2012. The carrying value and fair value of the Level II instruments, which only included the Series B unsecured senior notes at December 31,2011, was $83.0 million and $88.9 million, respectively.
[3] Fair value calculated using Level I inputs.