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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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