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Debt Obligations, net (Future Scheduled Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
2014 $ 21,657  
2015 105,765  
2016 926,403  
2017 2,185,604  
2018 617,052  
Thereafter 340,108  
Total principal maturities 4,196,589 4,745,807
Unamortized debt discounts, net (38,464) (54,313)
Total long-term debt obligations, net 4,158,125 4,691,494
Unsecured Debt
   
Debt Instrument [Line Items]    
2014 0  
2015 105,765  
2016 926,403  
2017 374,722  
2018 600,000  
Thereafter 100,000  
Total principal maturities 2,106,890  
Unamortized debt discounts, net (11,081)  
Total long-term debt obligations, net 2,095,809  
Secured Debt
   
Debt Instrument [Line Items]    
2014 21,657  
2015 0  
2016 0  
2017 1,810,882  
2018 17,052  
Thereafter 240,108  
Total principal maturities 2,089,699  
Unamortized debt discounts, net (27,383)  
Total long-term debt obligations, net $ 2,062,316