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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, 2014 | Sep. 30, 2013 | Sep. 30, 2014 note | Sep. 30, 2013 | Dec. 31, 2013 note
Related party transactions |  |  |  |  |
Interest expense, related party | $ 3,671 | $ 3,745 | $ 11,069 | $ 11,289 |
Loans to unconsolidated joint ventures | 3,361 |  | 3,361 |  | 2,756
Due from affiliates | 31,422 |  | 31,422 |  | 30,132
Related parties note receivable, AWE Talisman Company |  |  |  |  |
Related party transactions |  |  |  |  |
Interest income, related party | 156 | 157 | 467 | 467 |
Number of notes receivable (in notes) |  |  | 2 |  | 2
Note receivable, interest rate (as a percent) | 5.00% |  | 5.00% |  |
Debt, carrying value | 14,071 |  | 14,071 |  | 13,603
Related parties note receivable, RED Consolidated Holdings, LLC |  |  |  |  |
Related party transactions |  |  |  |  |
Interest income, related party | 154 | 176 | 468 | 356 |
Due from affiliates | 11,454 |  | 11,454 |  | 12,707
Note receivable, interest rate (as a percent) | 5.25% |  | 5.25% |  |
Northwestern Mutual Life (NML) |  |  |  |  |
Related party transactions |  |  |  |  |
Interest expense payable, related party | 1,322 |  | 1,322 |  | 1,240
Unconsolidated joint ventures |  |  |  |  |
Related party transactions |  |  |  |  |
Interest income, related party | 53 | 58 | 162 | 178 |
Due from affiliates | 5,897 |  | 5,897 |  | 3,822
Unconsolidated joint ventures and third-party managed properties |  |  |  |  |
Related party transactions |  |  |  |  |
Management Fees | 4,613 | 5,286 | 14,328 | 16,286 |
Development and Leasing Fees | 3,046 | 3,810 | 8,424 | 8,284 |
Fees charged to unconsolidated joint ventures and third-party managed properties | $ 7,659 | $ 9,096 | $ 22,752 | $ 24,570 |

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