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Related-Party Transactions: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014 note	Mar. 31, 2013	Dec. 31, 2013 note
Related party transactions
Interest expense, related party	$ 3,708	$ 3,780
Loans to unconsolidated joint ventures	3,374		2,756
Due from affiliates	28,559		30,132
Unconsolidated joint ventures
Related party transactions
Interest income, related party	31	61
Due from affiliates	2,507		3,822
Northwestern Mutual Life (NML)
Related party transactions
Interest expense payable, related party	1,234		1,240
Unconsolidated joint ventures and third-party managed properties
Related party transactions
Management Fees	4,825	5,493
Development and Leasing Fees	2,496	1,695
Fees charged to unconsolidated joint ventures and third-party managed properties	7,321	7,188
Related parties note receivable, AWE Talisman Company
Related party transactions
Interest income, related party	154	154
Number of notes receivable (in notes)	2		2
Note receivable, interest rate (as a percent)	5.00%
Debt, carrying value	13,758		13,603
Related parties note receivable, RED Consolidated Holdings, LLC
Related party transactions
Interest income, related party	160	6
Due from affiliates	$ 12,294		$ 12,707
Note receivable, interest rate (as a percent)	5.25%

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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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