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Related Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Related party transactions
Interest expense, related party	$ 3,764	$ 3,833	$ 7,544	$ 7,773
Loans to unconsolidated joint ventures	2,749		2,749		3,345
Due from affiliates	30,747		30,747		17,068
Unconsolidated joint ventures
Related party transactions
Management Fees	5,506	5,861	11,000	11,909
Development and Leasing Fees	2,779	3,631	4,475	6,854
Fees charged to unconsolidated joint ventures and third-party managed properties	8,285	9,492	15,475	18,763
Loans to unconsolidated joint ventures	2,749		2,749		3,345
Interest income, related party	59	64	120	129
Due from affiliates	4,049		4,049		4,568
Northwestern Mutual Life ("NML")
Related party transactions
Interest expense, related party	3,764	3,833	7,544	7,773
Interest expense payable, related party	1,253		1,253		1,264
AWE Talisman
Related party transactions
Number of notes receivable			2
Interest income, related party	156	155	310	163
Interest rate (as a percent)	5.00%		5.00%
Balance on notes	13,288		13,288		12,500
RED Consolidated Holdings, LLC ("RED")
Related party transactions
Interest income, related party	175		181
Due from affiliates	$ 13,410		$ 13,410
Interest rate (as a percent)	5.25%		5.25%

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