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Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands							6 Months Ended
	May 16, 2017	Feb. 15, 2017	Nov. 17, 2016	Aug. 16, 2016	May 18, 2016	Feb. 16, 2016	Jun. 30, 2017	Jun. 30, 2016
Distributions
Dividend declared per common stock (in dollars per share)	$ 0.12	$ 0.1200	$ 0.1200	$ 0.095	$ 0.095	$ 0.1875
Total Dividends	$ 8,500	$ 8,500	$ 8,400	$ 6,700	$ 6,700	$ 13,100	$ 16,992	$ 19,763

X

- 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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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=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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