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Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended
	Feb. 14, 2018	Nov. 15, 2017	Aug. 15, 2017	May 16, 2017	Feb. 15, 2017	Mar. 31, 2018	Mar. 31, 2017
Distributions
Dividends per Common Share (in dollars per share)	$ 0.12	$ 0.12	$ 0.1200	$ 0.12	$ 0.1200	$ 0.12	$ 0.12
Total Dividends	$ 8,532	$ 8,536	$ 8,536	$ 8,534	$ 8,458	$ 8,532	$ 8,458

X

- Definition

Aggregate dividends paid 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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X

- References

No definition available.

+ Details

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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