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The number of real estate properties that had been sold as of the balance sheet date.

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Number Of Real Estate Property Sold

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Area of a real estate property.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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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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Face (par) amount of debt instrument at time of issuance.

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The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing the oil and gas.

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

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No definition available.

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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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Amount of escrow deposit disbursements related to property acquisition in noncash investing or financing transactions.

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Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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

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

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No definition available.

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

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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 Office Properties - 2014 Acquisitions (Details) ft² in Millions										12 Months Ended
	Dec. 31, 2014 USD ($) a	Dec. 30, 2014 USD ($) a	Dec. 09, 2014 USD ($) property	Nov. 17, 2014 USD ($)	Jul. 29, 2014 USD ($)	Apr. 14, 2014 USD ($)	Apr. 10, 2014 USD ($) property	Jan. 30, 2014 USD ($) property	Jul. 03, 2013 USD ($)	Dec. 31, 2015 USD ($) ft² property	Dec. 31, 2014 USD ($) a	Dec. 31, 2013 USD ($)	Apr. 30, 2014
Business Acquisition [Line Items]
Payments to acquire additional interest in subsidiaries										$ 0	$ 43,502,000	$ 0
Ownership percentage										95.90%
Payments to acquire loans receivable										$ 0	0	$ 3,523,000
Area of real estate property (in acres) \| ft²										14.1
Fair Value, Inputs, Level 2 \| Austin Joint Venture
Business Acquisition [Line Items]
Fair value of equity interest				$ 124,700,000
Frost Bank Tower, 300 West 6th Street, and One American Center
Business Acquisition [Line Items]
Net proceeds from the sale				$ 43,600,000
Gain on disposal of assets											52,800,000
CalSTRS \| Frost Bank Tower, 300 West 6th Street, and One American Center
Business Acquisition [Line Items]
Ownership interest of disposal group (percent)				40.00%
Net proceeds from the sale				$ 43,600,000
Gain on disposal of assets				$ 52,800,000
Hayden Ferry Lakeside III
Business Acquisition [Line Items]
Payments to acquire additional interest in subsidiaries						$ 2,000,000
Ownership percentage						70.00%							70.00%
Cumulative development costs	$ 24,000,000										$ 24,000,000
The Forum at West Paces \| Mortgage Receivable
Business Acquisition [Line Items]
Original principal amount					$ 50,000,000
Payments to acquire loans receivable					$ 47,000,000
Office Building
Business Acquisition [Line Items]
Number of real estate properties \| property										35
Office Building \| Florida \| Courvoisier Centre
Business Acquisition [Line Items]
Number of real estate properties \| property							2
Office Building \| Six States
Business Acquisition [Line Items]
Number of real estate properties sold \| property			19
Net Sales Price			$ 234,800,000
JTB Center \| Office Building
Business Acquisition [Line Items]
Number of real estate properties \| property								3
Gross purchase price								$ 33,300,000
Courvoisier Centre \| Florida
Business Acquisition [Line Items]
Gross purchase price							$ 145,800,000
One Orlando Centre \| Florida
Business Acquisition [Line Items]
Gross purchase price						$ 55,100,000
Payments to acquire additional interest in subsidiaries						1,100,000
Equity investment held in lender reserve accounts						$ 8,000,000
Ownership interest acquired (as a percent)						100.00%
Mortgage assumed						$ 68,300,000
One Orlando Centre \| Florida \| First Mortgage
Business Acquisition [Line Items]
Mortgage notes payable						54,000,000.0
One Orlando Centre \| Florida \| Second Mortgage
Business Acquisition [Line Items]
Mortgage notes payable						$ 15,300,000.0
Millenia Park One \| Office Building
Business Acquisition [Line Items]
Gross purchase price									$ 25,500,000
San Jacinto Center and One Congress Plaza \| CalSTRS
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)				60.00%
Ownership of property after acquisition (as a percent)				100.00%
Corporate Center I, II, and III \| Florida
Business Acquisition [Line Items]
Gross purchase price			$ 240,100,000
Land \| Florida
Business Acquisition [Line Items]
Gross purchase price	$ 4,800,000	$ 4,700,000
Area of real estate property (in acres) \| a	6.5	7									6.5