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Related-Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Related party transactions |  |  |
Interest expense, related party | $ 16,743 | $ 14,254 | $ 19,413
Loans to unconsolidated joint ventures | 3,995 | 3,095 |
Due from affiliates | 3,387 | 6,599 |
Unconsolidated joint ventures |  |  |
Related party transactions |  |  |
Management Fees | 26,838 | 26,781 | 24,323
Development and Leasing Fees | 9,955 | 11,488 | 9,228
Fees charged to unconsolidated joint ventures and third-party managed properties | 36,793 | 38,269 | 33,551
Interest income, related party | 276 | 184 | 46
Northwestern Mutual Life ("NML") |  |  |
Related party transactions |  |  |
Interest expense, related party | 16,743 | 14,254 | 19,413
Interest expense payable, related party | $ 1,379 | $ 1,439 |

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