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Related Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Related party transactions |  |  |
Interest expense, related party | $ 3,780 | $ 3,940 |
Loans to unconsolidated joint ventures | 3,366 |  | 3,345
Due from affiliates | 31,197 |  | 17,068
Unconsolidated joint ventures |  |  |
Related party transactions |  |  |
Management Fees | 5,493 | 6,082 |
Development and Leasing Fees | 1,695 | 3,224 |
Fees charged to unconsolidated joint ventures and third-party managed properties | 7,188 | 9,306 |
Interest income, related party | 61 | 65 |
Due from affiliates | 4,734 |  | 4,568
Northwestern Mutual Life ("NML") |  |  |
Related party transactions |  |  |
Interest expense, related party | 3,780 | 3,940 |
Interest expense payable, related party | 1,258 |  | 1,264
AWE Talisman |  |  |
Related party transactions |  |  |
Number of notes receivable | 2 |  |
Interest income, related party | 154 | 8 |
Due from affiliates | 12,500 |  | 12,500
Interest rate (as a percent) | 5.00% |  |
RED Consolidated Holdings, LLC ("RED") |  |  |
Related party transactions |  |  |
Due from affiliates | $ 13,330 |  |
Interest rate (as a percent) | 5.25% |  |

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