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Equity Method Investment, Additional Interest Acquired

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Number of Equity Method Investments

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of difference between the carrying amount and the sales price of real estate properties sold as part of discontinued operations.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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Total amount of new mortgage loans on real estate during the reporting period.

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The number of real estate properties owned as of the balance sheet date.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Investment in Unconsolidated Joint Ventures - Narrative (Details) $ in Thousands							12 Months Ended
	Nov. 06, 2015 USD ($)	Nov. 17, 2014 USD ($)	Feb. 10, 2014 USD ($)	Jan. 24, 2014 USD ($)	Dec. 13, 2013 USD ($)	Jun. 03, 2013 USD ($)	Dec. 31, 2015 USD ($) property equity_investment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 19, 2013	Nov. 05, 2013 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of equity method investments \| equity_investment							3
Investment in unconsolidated joint ventures							$ 39,592	$ 55,550
New mortgage loans							0	47,000	$ 3,523
Gain on sale of real estate from discontinued operations							0	10,463	32,493
Payments to acquire equity method investments							$ 4,705	3,505	$ 86,685
Ownership percentage							95.90%
Frost Bank Tower, 300 West 6th Street, and One American Center
Schedule of Equity Method Investments [Line Items]
Net proceeds from the sale		$ 43,600
Gain on disposal of assets								52,800
CalSTRS \| Frost Bank Tower, 300 West 6th Street, and One American Center
Schedule of Equity Method Investments [Line Items]
Ownership interest of disposal group (percent)		40.00%
Net proceeds from the sale		$ 43,600
Gain on disposal of assets		$ 52,800
Consolidated Properties
Schedule of Equity Method Investments [Line Items]
Number of real estate properties \| property							35
7000 Central Park
Schedule of Equity Method Investments [Line Items]
Interest rate on mortgage					1.97%
Previously acquired interest percentage											40.00%
Investment in unconsolidated joint ventures					$ 7,600						$ 45,000
New mortgage loans					$ 30,000
7000 Central Park \| LIBOR
Schedule of Equity Method Investments [Line Items]
Derivative basis spread over variable rate					1.75%
Debt instrument variable rate basis					LIBOR
7000 Central Park \| One-Month LIBOR
Schedule of Equity Method Investments [Line Items]
Derivative basis spread over variable rate					180.00%
7000 Central Park \| Preferred Stock
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures											37,000
7000 Central Park \| Common Stock
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures											$ 8,000
Percentage of equity interest											40.00%
US Airways Building Tenancy in Common
Schedule of Equity Method Investments [Line Items]
Balance of the mortgage loan							$ 3,300	3,400
First Mortgage \| US Airways Building Tenancy in Common
Schedule of Equity Method Investments [Line Items]
Balance of the mortgage loan							13,100	13,400
San Jacinto Center and One Congress Plaza \| CalSTRS
Schedule of Equity Method Investments [Line Items]
Ownership interest acquired (as a percent)		60.00%
Ownership of property after acquisition (as a percent)		100.00%
CalSTRS Joint Venture \| CalSTRS
Schedule of Equity Method Investments [Line Items]
Ownership interest acquired (as a percent)			60.00%
Payments to acquire interest in joint venture			$ 24,900
7000 Central Park JV LLC (7000 Central Park)
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures							$ 120	15,790
Percentage of equity interest							40.00%
Gross sale price	$ 85,300
Gain on sale of real estate from discontinued operations	9,700
7000 Central Park JV LLC (7000 Central Park) \| Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Gain on sale of real estate from discontinued operations	$ 30,500
Tryon Place LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures							$ 1,000	0
Percentage of equity interest							14.80%
Austin Joint Venture
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest										33.00%
Austin Joint Venture \| Parkway Properties Inc. and Madison International Realty
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest										50.00%
CalSTRS Joint Venture
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest			40.00%
Additional interest acquired in equity method investment				17.00%
Payments to acquire equity method investments				$ 41,500
CalSTRS Joint Venture \| CalSTRS
Schedule of Equity Method Investments [Line Items]
Ownership percentage			60.00%
US Airways Building Tenancy in Common
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures							$ 38,472	$ 39,760
Percentage of equity interest							74.58%
US Airways Building Tenancy in Common \| US Airways Building Tenancy in Common
Schedule of Equity Method Investments [Line Items]
Total purchase price						$ 41,800
Leased percentage of a property acquisition						100.00%
Months notice of termination							12 months
US Airways Building Tenancy in Common \| US Airways Building Tenancy in Common \| US Airways Building Tenancy in Common
Schedule of Equity Method Investments [Line Items]
Interest rate on mortgage (in percent)						3.00%
US Airways Building Tenancy in Common \| US Airways Building Tenancy in Common \| US Airways Building Tenancy in Common \| Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest						74.60%
US Airways Building Tenancy in Common \| US Airways Building Tenancy in Common \| US Airways Building Tenancy in Common \| U.S. Airways \| Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership percentage						25.40%
US Airways Building Tenancy in Common \| US Airways Building Tenancy in Common \| First Mortgage \| US Airways Building Tenancy in Common \| Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
New mortgage loans						$ 13,900