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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
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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

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