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Related-Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 note | Jun. 30, 2013 | Dec. 31, 2013 note
Related party transactions |  |  |  |  |
Interest expense, related party | $ 3,690 | $ 3,764 | $ 7,398 | $ 7,544 |
Loans to unconsolidated joint ventures | 3,396 |  | 3,396 |  | 2,756
Due from affiliates | 29,192 |  | 29,192 |  | 30,132
Related parties note receivable, AWE Talisman Company |  |  |  |  |
Related party transactions |  |  |  |  |
Interest income, related party | 156 | 156 | 310 | 310 |
Number of notes receivable (in notes) |  |  | 2 |  | 2
Note receivable, interest rate (as a percent) | 5.00% |  | 5.00% |  |
Debt, carrying value | 13,913 |  | 13,913 |  | 13,603
Related parties note receivable, RED Consolidated Holdings, LLC |  |  |  |  |
Related party transactions |  |  |  |  |
Interest income, related party | 154 | 175 | 314 | 181 |
Due from affiliates | 11,874 |  | 11,874 |  | 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 | 1,228 |  | 1,228 |  | 1,240
Unconsolidated joint ventures |  |  |  |  |
Related party transactions |  |  |  |  |
Interest income, related party | 78 | 59 | 109 | 120 |
Due from affiliates | 3,405 |  | 3,405 |  | 3,822
Unconsolidated joint ventures and third-party managed properties |  |  |  |  |
Related party transactions |  |  |  |  |
Management Fees | 4,890 | 5,506 | 9,714 | 11,000 |
Development and Leasing Fees | 2,882 | 2,779 | 5,378 | 4,475 |
Fees charged to unconsolidated joint ventures and third-party managed properties | $ 7,772 | $ 8,285 | $ 15,092 | $ 15,475 |

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