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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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

+ References

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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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No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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Mortgage Loan Receivable (Details) - USD ($) $ in Thousands		12 Months Ended
Mortgage Loan Receivable (Details) - USD ($) $ in Thousands	Jun. 03, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]
New mortgage loans		$ 0	$ 47,000	$ 3,523
Remaining interest (as a percent)		95.90%
US Airways Building
Mortgage Loans on Real Estate [Line Items]
Balance of the mortgage loan		$ 3,300	3,400
US Airways Building
Mortgage Loans on Real Estate [Line Items]
Ownership percentage		74.58%
First Mortgage \| US Airways Building
Mortgage Loans on Real Estate [Line Items]
Balance of the mortgage loan		$ 13,100	$ 13,400
US Airways Building \| US Airways Building \| US Airways Building
Mortgage Loans on Real Estate [Line Items]
Interest rate on mortgage (in percent)	3.00%
US Airways Building \| Unconsolidated Properties \| US Airways Building \| US Airways Building
Mortgage Loans on Real Estate [Line Items]
Ownership percentage	74.60%
US Airways Building \| Unconsolidated Properties \| US Airways Building \| US Airways Building \| U.S. Airways
Mortgage Loans on Real Estate [Line Items]
Remaining interest (as a percent)	25.40%
US Airways Building \| Unconsolidated Properties \| First Mortgage \| US Airways Building \| US Airways Building
Mortgage Loans on Real Estate [Line Items]
New mortgage loans	$ 13,900