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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
Jun. 30, 2013
Dec. 31, 2012
Extinguishment of Debt [Line Items]    
2013 $ 5,700  
2014 244,141  
2015 411,463  
2016 346,528  
2017 330,323  
Thereafter 1,047,407  
Total principal payments 2,385,562  
Net unamortized premiums/(discounts) (5,817)  
Total Debt Obligations $ 2,379,745 $ 2,465,330