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Dividends Declared and Paid - Dividend Information (Details) - $ / shares																											3 Months Ended								12 Months Ended
	Dec. 29, 2017	Nov. 30, 2017	Oct. 31, 2017	Sep. 29, 2017	Aug. 31, 2017	Jul. 31, 2017	Jun. 30, 2017	May 26, 2017	Apr. 28, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Dec. 30, 2016	Nov. 30, 2016	Oct. 31, 2016	Sep. 30, 2016	Aug. 31, 2016	Jul. 29, 2016	Jun. 30, 2016	May 31, 2016	Apr. 29, 2016	Mar. 31, 2016	Feb. 29, 2016	Jan. 29, 2016	Jan. 15, 2016	Dec. 31, 2015	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Common Share Distribution Amount (in dollars per share)	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.10	$ 0.10	$ 0.08	$ 0.08	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.39	$ 1.32	$ 1.38
LTIP Unit Distribution Amount (in dollars per share)	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.10	0.10	0.08		0.33	0.33	0.33	0.33	0.33	0.33	0.33	0.39	1.32	1.38
Ordinary Income (in dollars per share)	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.099	0.099	0.099	0.099	0.099	0.099	0.099	0.099	0.099	0.099	0.090	0.090	0.072		0.3126	0.3126	0.3126	0.3126	0.297	0.297	0.297	0.351	1.2504	1.242
Unrecaptured section 1250 gain (in dollars per share)	$ 0.0058	$ 0.0058	$ 0.0058	$ 0.0058	$ 0.0058	$ 0.0058	$ 0.0058	$ 0.0058	$ 0.0058	$ 0.0058	$ 0.0058	$ 0.0058															$ 0.0174	$ 0.0174	$ 0.0174	$ 0.0174					$ 0.0696
Capital Gain (in dollars per share)													$ 0.011	$ 0.011	$ 0.011	$ 0.011	$ 0.011	$ 0.011	$ 0.011	$ 0.011	$ 0.011	$ 0.011	$ 0.010	$ 0.010	$ 0.008						$ 0.033	$ 0.033	$ 0.033	$ 0.039		$ 0.138

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- Definition

Return of Capital, Dividends, Per Share

+ References

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- Definition

Distributions On Long Term Investment Plan

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- Definition

Ordinary Income, Dividends, Per Share

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- Definition

Unrecaptured Section 1250 Gain

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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