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Debt Obligations, net (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Aggregate amounts of principal maturities of long-term debt    
2013 (remaining six months) $ 0  
2014 210,013  
2015 105,765  
2016 734,499  
2017 2,441,776  
Thereafter 960,838  
Total principal maturities 4,452,891 4,745,807
Unamortized debt discounts, net (50,444) (54,313)
Total long-term debt obligations, net 4,402,447 4,691,494
Unsecured Debt
   
Aggregate amounts of principal maturities of long-term debt    
2013 (remaining six months) 0  
2014 200,601  
2015 105,765  
2016 726,403  
2017 374,722  
Thereafter 700,000  
Total principal maturities 2,107,491  
Unamortized debt discounts, net (14,720)  
Total long-term debt obligations, net 2,092,771  
Secured Debt
   
Aggregate amounts of principal maturities of long-term debt    
2013 (remaining six months) 0  
2014 9,412  
2015 0  
2016 8,096  
2017 2,067,054  
Thereafter 260,838  
Total principal maturities 2,345,400  
Unamortized debt discounts, net (35,724)  
Total long-term debt obligations, net $ 2,309,676