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Dividends Declared and Paid - Dividend Information (Details) - $ / shares	1 Months Ended																								3 Months Ended								12 Months Ended
	Dec. 30, 2018	Nov. 30, 2018	Oct. 31, 2018	Sep. 30, 2018	Aug. 31, 2018	Jul. 31, 2018	Jun. 29, 2018	May 31, 2018	Apr. 30, 2018	Mar. 30, 2018	Feb. 28, 2018	Jan. 30, 2018	Dec. 30, 2017	Nov. 30, 2017	Oct. 31, 2017	Sep. 29, 2017	Aug. 31, 2017	Jul. 31, 2017	Jun. 29, 2017	May 31, 2017	Apr. 30, 2017	Mar. 30, 2017	Feb. 28, 2017	Jan. 30, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
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	$ 0.11	$ 0.11	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 1.32	$ 1.32
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	0.11	0.11	0.33	0.33	0.33	0.33	0.33	0.33	0.33	0.33	1.32	1.32
Ordinary Income (in dollars per share)	0.0954	0.0954	0.0954	0.0954	0.0954	0.0954	0.0954	0.0954	0.0954	0.0954	0.0954	0.0954	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.1042	0.2862	0.2862	0.2862	0.2862	0.3126	0.3126	0.3126	0.3126	1.1448	1.2504
Capital Gain (in dollars per share)	$ 0.0146	$ 0.0146	$ 0.0146	$ 0.0146	$ 0.0146	$ 0.0146	$ 0.0146	$ 0.0146	$ 0.0146	$ 0.0146	$ 0.0146	$ 0.0146													$ 0.0438	$ 0.0438	$ 0.0438	$ 0.0438					$ 0.1752
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

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- Definition

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

+ References

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

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- References

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- Definition

Return of Capital, Dividends, Per Share

+ References

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- Definition

Distributions On Long Term Investment Plan

+ References

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- Definition

Ordinary Income, Dividends, Per Share

+ References

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- Definition

Unrecaptured Section 1250 Gain

+ References

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