Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Subsequent Events (Details) - $ / shares	1 Months Ended	3 Months Ended		9 Months Ended
Subsequent Events (Details) - $ / shares	Oct. 18, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Subsequent Event [Line Items]
Dividends declared per Common Share (in dollars per share)		$ 0.4625	$ 0.440	$ 1.3875	$ 1.320
Dividend Declared [Member] \| Highwoods Properties, Inc. [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends declared per Common Share (in dollars per share)	$ 0.4625