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Debt Obligations, net (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Aggregate amounts of principal maturities of long-term debt    
2013 (remaining nine months) $ 545,254  
2014 201,454  
2015 105,765  
2016 521,712  
2017 2,518,136  
Thereafter 662,636  
Total principal maturities 4,554,957 4,745,807
Unamortized debt discounts, net (60,320) (54,313)
Total long-term debt obligations, net 4,494,637 4,691,494
Unsecured Debt
   
Aggregate amounts of principal maturities of long-term debt    
2013 (remaining nine months) 545,254  
2014 200,601  
2015 105,765  
2016 461,403  
2017 374,722  
Thereafter 400,000  
Total principal maturities 2,087,745  
Unamortized debt discounts, net (17,358)  
Total long-term debt obligations, net 2,070,387  
Secured Debt
   
Aggregate amounts of principal maturities of long-term debt    
2013 (remaining nine months) 0  
2014 853  
2015 0  
2016 60,309  
2017 2,143,414  
Thereafter 262,636  
Total principal maturities 2,467,212  
Unamortized debt discounts, net (42,962)  
Total long-term debt obligations, net $ 2,424,250