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Summary of Significant Accounting Policies - Revenue Recognition and Accounts Receivable and Allowance (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Accounting Policies [Line Items] |  |  |  |
Stated interest rate |  | 3.875% |  |
Operating Lease Term, Average, Minimum | 3 years |  |  |
Operating Lease Term, Average, Maximum | 5 years |  |  |
Rents and other receivables, allowance for doubtful accounts | $ 10,958,000 | $ 8,683,000 | $ 7,259,000 | $ 5,137,000
Allowance for Doubtful Accounts Receivable | 3,800,000 | 3,800,000 | 3,400,000 |
Write-offs of Accounts Receivable | 1,500,000 | 2,400,000 | 1,200,000 |
Notes receivable, net | 7,297,000 | 7,348,000 |  |
2445 M Street [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Notes receivable, net | $ 6,617,000 | $ 6,975,000 |  |

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