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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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