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Commitments and Contingencies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 sqft years | Dec. 31, 2010 | Dec. 31, 2009
Operating ground leases [Abstract] |  |  |
Rental property expense | $ 1,400,000 | $ 1,500,000 | $ 1,600,000
Operating ground leases, scheduled future minimum payments [Abstract] |  |  |
Operating leases, future minimum payments due, current | 1,324,000 |  |
Operating leases, future minimum payments, year two | 1,345,000 |  |
Operating leases, future minimum payments, year three | 1,366,000 |  |
Operating leases, future minimum payments, year four | 1,389,000 |  |
Operating leases, future minimum payments, year five | 1,413,000 |  |
Operating leases, future minimum payments, thereafter | 31,526,000 |  |
Operating leases, total future minimum payments due | 38,363,000 |  |
Lease and Contractual Commitments [Abstract] |  |  |
Lease and contractual commitments | 59,800,000 |  |
Accrued amount of lease and contractual commitments | 10,300,000 |  |
DLF I obligation [Abstract] |  |  |
Excess contribution, gross | 7,200,000 |  |
Term to repay excess contribution (in years) | 14 |  |
Excess contribution, initial repayment date | 3/12/1999 |  |
Excess contribution, net discounted amount | 3,800,000 |  |
Excess contribution, discount rate | 9.62% |  |
Excess contribution, payments | 600,000 | 600,000 | 600,000
Excess contribution, discounted balance | 800,000 | 1,200,000 |
Non Recourse Debt [Abstract] |  |  |
Secured debt of unconsolidated affiliate at disposition date |  | 170,000,000 |
Rent Guarantee [Abstract] |  |  |
Number of properties sold relating to rent guarantee | 6 |  |
Number of customers relating to rent guarantee | 1 |  |
Term of lease agreement (in years) | 14 |  |
Period of rent payments in guarantee (in years) | 2 |  |
Date at which rent guarantee began | 2011-03 |  |
Date at which rent guarantee ends | 2013-06 |  |
Square feet of lease in rent guarantee (in sq feet) | 237,500 |  |
Maximum exposure under rent guarantee | $ 300,000 |  |

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