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Noncontrolling Interests: (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Noncontrolling Interest [Abstract] |  |
Ownership interest in operating partnership (as a percent) | 94.00% | 93.00%
Limited partnership interest of the operating partnership (as a percent) | 6.00% | 7.00%
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Number of trading days used to calculate redemption value (in days) | 10 days |
Redemption value of outstanding OP Units not owned by the Company | $ 557,651 | $ 586,409

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- Details
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