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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financial Assets And Liabilities Measured At Fair Value |  |
Marketable securities | $ 43,191 | $ 44,646
Short-term Investments | 0 | 24,998
Interest rate cap (included in other assets) |  | 11
Total assets | 43,191 | 69,655
Liabilities measured at fair value | 0 | 0
Carrying Reported Amount Fair Value Disclosure [Member] |  |
Assets |  |
Cash Equivalents | 226,476 | 111,590
Liabilities |  |
Mortgages payable (excluding deferred debt issuance costs, net) | 1,059,587 | 1,032,780
Estimate Of Fair Value Fair Value Disclosure [Member] |  |
Assets |  |
Cash Equivalents | 226,476 | 111,590
Liabilities |  |
Mortgages payable (excluding deferred debt issuance costs, net) | 1,054,000 | 1,025,000
Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets And Liabilities Measured At Fair Value |  |
Marketable securities | 43,191 | 44,646
Short-term Investments |  | 24,998
Interest rate cap (included in other assets) |  | 0
Total assets | 43,191 | 69,644
Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets And Liabilities Measured At Fair Value |  |
Marketable securities | 0 | 0
Short-term Investments |  | 0
Interest rate cap (included in other assets) |  | 11
Total assets | 0 | 11
Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets And Liabilities Measured At Fair Value |  |
Marketable securities | 0 | 0
Short-term Investments |  | 0
Interest rate cap (included in other assets) |  | 0
Total assets | $ 0 | $ 0

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