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Debt Obligations, net (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Aggregate amounts of principal maturities of long-term debt    
2013 $ 545,254 [1]  
2014 200,601 [1]  
2015 151,929 [1]  
2016 596,219 [1]  
2017 2,587,372 [1]  
Thereafter 664,432 [1]  
Total principal maturities 4,745,807 [1] 5,874,183
Unamortized debt discounts, net (54,313) [1] (36,643)
Total long-term debt obligations, net 4,691,494 [1] 5,837,540
Unsecured Debt
    
Aggregate amounts of principal maturities of long-term debt    
2013 545,254 [1]  
2014 200,601 [1]  
2015 105,765 [1]  
2016 461,403 [1]  
2017 374,722 [1]  
Thereafter 400,000 [1]  
Total principal maturities 2,087,745 [1]  
Unamortized debt discounts, net (19,147) [1]  
Total long-term debt obligations, net 2,068,598 [1]  
Secured Debt
    
Aggregate amounts of principal maturities of long-term debt    
2013 0 [1]  
2014 0 [1]  
2015 46,164 [1]  
2016 134,816 [1]  
2017 2,212,650 [1]  
Thereafter 264,432 [1]  
Total principal maturities 2,658,062 [1]  
Unamortized debt discounts, net (35,166) [1]  
Total long-term debt obligations, net $ 2,622,896 [1]  
[1] Includes minimum required amortization payments on the March 2012 Secured Credit Facilities and the October 2012 Secured Credit Facility.