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Debt Obligations Debt Obligations (Aggregate Scheduled Principal Payments of Debt Obligation, Excluding Amortization of Discounts and Premiums) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Extinguishment of Debt [Line Items]    
2013 $ 8,473  
2014 250,321  
2015 416,568  
2016 347,038  
2017 330,323  
Thereafter 1,047,407  
Total principal payments 2,400,130  
Net unamortized premiums/(discounts) (6,198)  
Total Debt Obligations $ 2,393,932 $ 2,465,330