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Related Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Related party transactions |  |  |
Interest expense, related party | $ 15,386 | $ 16,743 | $ 14,254
Loans to unconsolidated joint ventures | 3,345 | 3,995 |
Due from affiliates | 17,068 | 3,387 |
Unconsolidated joint ventures |  |  |
Related party transactions |  |  |
Interest income, related party | 254 | 276 | 184
Northwestern Mutual Life ("NML") |  |  |
Related party transactions |  |  |
Interest expense, related party | 15,386 | 16,743 | 14,254
Interest expense payable, related party | 1,264 | 1,379 |
Unconsolidated joint ventures and third-party managed properties |  |  |
Related party transactions |  |  |
Management Fees | 24,007 | 26,838 | 26,781
Development and Leasing Fees | 13,165 | 9,955 | 11,488
Fees charged to unconsolidated joint ventures and third-party managed properties | 37,172 | 36,793 | 38,269
Due from affiliates | $ 4,568 | $ 3,387 |

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