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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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