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Related-Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 note | Sep. 30, 2012 | Dec. 31, 2012 note
Related party transactions |  |  |  |  |
Interest expense, related party | $ 3,745 | $ 3,815 | $ 11,289 | $ 11,588 |
Loans to unconsolidated joint ventures | 2,736 |  | 2,736 |  | 3,345
Due from affiliates | 32,299 |  | 32,299 |  | 17,068
Unconsolidated joint ventures |  |  |  |  |
Related party transactions |  |  |  |  |
Interest income, related party | 58 | 63 | 178 | 191 |
Due from affiliates | 5,740 |  | 5,740 |  | 4,568
Northwestern Mutual Life (NML) |  |  |  |  |
Related party transactions |  |  |  |  |
Interest expense payable, related party | 1,246 |  | 1,246 |  | 1,264
Unconsolidated joint ventures and third-party managed properties |  |  |  |  |
Related party transactions |  |  |  |  |
Management Fees | 5,286 | 5,861 | 16,286 | 17,862 |
Development and Leasing Fees | 3,810 | 3,677 | 8,284 | 9,764 |
Fees charged to unconsolidated joint ventures and third-party managed properties | 9,096 | 9,538 | 24,570 | 27,626 |
Related parties note receivable, AWE Talisman Company |  |  |  |  |
Related party transactions |  |  |  |  |
Interest income, related party | 157 | 158 | 467 | 321 |
Number of Notes Receivable (in notes) |  |  | 2 |  | 2,000
Note receivable, interest rate (as a percent) | 5.00% |  | 5.00% |  |
Debt, carrying value | 13,446 |  | 13,446 |  | 12,500
Related parties note receivable, RED Consolidated Holdings, LLC |  |  |  |  |
Related party transactions |  |  |  |  |
Interest income, related party | 176 |  | 356 |  |
Due from affiliates | $ 13,113 |  | $ 13,113 |  |
Note receivable, interest rate (as a percent) | 5.25% |  | 5.25% |  |

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