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Related-Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related party transactions
Interest expense, related party	$ 15,016	$ 15,386	$ 16,743
Loans to unconsolidated joint ventures	2,756	3,345
Due from affiliates	30,132	17,068
Related Parties Note Receivable, AWE Talisman Company
Related party transactions
Interest income, related party	625	478
Notes receivable interest rate	5.00%	5.00%
Number of notes receivable	2	2,000
Carrying value of term loan	13,603	12,500
Related Parties Note Receivable, RED Consolidated Holdings, LLC
Related party transactions
Interest income, related party	525
Due from affiliates	12,707
Notes receivable interest rate	5.25%
Unconsolidated joint ventures
Related party transactions
Interest income, related party	281	254	276
Due from affiliates	3,822	4,568
Northwestern Mutual Life (NML)
Related party transactions
Interest expense payable, related party	1,240	1,264
Unconsolidated joint ventures and third-party managed properties
Related party transactions
Management Fees	21,993	24,007	26,838
Development and Leasing Fees	10,859	13,165	9,955
Fees charged to unconsolidated joint ventures and third-party managed properties	$ 32,852	$ 37,172	$ 36,793

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Revenue, comprised of fees related to the development and leasing of joint venture properties and third-party managed properties.

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Amount of interest expense payable as of the balance sheet date on a debt or other obligation to a related party.

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The stated interest rate on the note receivable.

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Represents the number of notes receivable.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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