Investment in Unconsolidated Joint Ventures (Courvoisier Centre JV, LLC (Details) ft² in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) ft²	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Proceeds from sale of interest in unconsolidated joint venture	$ 12,514	$ 0	$ 0
Income from unconsolidated joint ventures	$ 47,115	$ 10,562	$ 8,302
Courvoisier Centre JV, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	20.00%
Square footage of real estate property (square feet) \| ft²	343
Proceeds from sale of interest in unconsolidated joint venture	$ 12,600
Income from unconsolidated joint ventures	716
Value of interest in the property before deduction for existing mortgage debt	$ 33,900
Courvoisier Centre JV, LLC \| Spanish Key LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	80.00%

Area of a real estate property.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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Fair value portion of investments accounted under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=66022186&loc=d3e32014-111567

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
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- Definition

The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

+ References

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- Definition

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.

+ References

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