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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
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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

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