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Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands																9 Months Ended
	Oct. 18, 2015	Aug. 17, 2015	Jul. 30, 2015	May. 18, 2015	Apr. 28, 2015	Feb. 17, 2015	Jan. 30, 2015	Nov. 17, 2014	Oct. 30, 2014	Aug. 18, 2014	Jul. 31, 2014	May. 16, 2014	Apr. 29, 2014	Mar. 28, 2014	Feb. 25, 2014	Sep. 30, 2015	Sep. 30, 2014
Dividends Payable [Line Items]
Dividend declared per common stock (in dollars per share)			$ 0.15		$ 0.15		$ 0.15		$ 0.15		$ 0.15		$ 0.15		$ 0.15
Total Dividends		$ 10,500		$ 10,400		$ 10,300		$ 10,300		$ 10,000		$ 10,000		$ 10,000		$ 31,167	$ 30,047
Subsequent Events
Dividends Payable [Line Items]
Dividend declared per common stock (in dollars per share)	$ 0.15

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 04



-Article 3

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+ References

No definition available.

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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://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=31042434&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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