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Equity - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended												12 Months Ended
	Feb. 16, 2021	Jan. 27, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Distributions
Declared Dividends per Common Share (in dollars per share)			$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.132	$ 0.132	$ 0.132	$ 0.132	$ 0.120	$ 0.120	$ 0.580	$ 0.554	$ 0.504
Dividends Paid			$ 22,177	$ 22,308	$ 22,176	$ 22,171	$ 22,031	$ 22,062	$ 17,206	$ 17,231	$ 17,156	$ 17,114	$ 15,486	$ 8,532	$ 88,832	$ 78,530	$ 58,288
Subsequent Event
Distributions
Declared Dividends per Common Share (in dollars per share)		$ 0.145
Dividends Paid	$ 22,200

X

- 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=120397183&loc=d3e187085-122770

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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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