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Leases (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Minimum Future Rental Receipts [Abstract] |  |  |
2013 | $ 335,434 |  |
2014 | 319,112 |  |
2015 | 276,155 |  |
2016 | 245,100 |  |
2017 | 222,542 |  |
Thereafter | 1,111,022 |  |
Future Minimum Payments Receivable | 2,509,365 |  |
Future Rental Payments [Abstract] |  |  |
2013 | 2,572 |  |
2014 | 2,328 |  |
2015 | 2,300 |  |
2016 | 1,971 |  |
2017 | 1,924 |  |
Thereafter | 15,885 |  |
Future Minimum Payments Due | 26,980 |  |
Rent expense | 1,198 | 776 | 955
Fixed rent per annum payment thereafter | 1,153 |  |
Incentive from lessor | 845 |  |
Office Space Leased for Regional Offices [Member] |  |  |
Future Rental Payments [Abstract] |  |  |
2013 | 82 |  |
2014 | 45 |  |
2015 | 36 |  |
2016 | 36 |  |
2017 | 9 |  |
Rent expense | $ 1,029 | $ 1,392 | $ 1,332

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