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Dividends per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends per Share [Abstract]
Payment of cash dividends									$ 76,058	$ 78,438	$ 81,187
Dividend Declared 2016-Q1 [Member]
Dividends per Share [Abstract]
Cash dividend paid (in dollars per share)								$ 0.355
Dividend Declared 2016-Q2 [Member]
Dividends per Share [Abstract]
Cash dividend paid (in dollars per share)							$ 0.355
Dividend Declared 2016-Q3 [Member]
Dividends per Share [Abstract]
Cash dividend paid (in dollars per share)						$ 0.355
Dividend Declared 2016-Q4 [Member]
Dividends per Share [Abstract]
Cash dividend paid (in dollars per share)					$ 0.355
Dividend Declared 2017-Q1 [Member]
Dividends per Share [Abstract]
Cash dividend paid (in dollars per share)				$ 0.36
Dividend Declared 2017-Q2 [Member]
Dividends per Share [Abstract]
Cash dividend paid (in dollars per share)			$ 0.36
Dividend Declared 2017-Q3 [Member]
Dividends per Share [Abstract]
Cash dividend paid (in dollars per share)		$ 0.36
Dividend Declared 2017-Q4 [Member]
Dividends per Share [Abstract]
Cash dividend paid (in dollars per share)	$ 0.36
Dividend Declared 2018-Q1 [Member]
Dividends per Share [Abstract]
Dividend payable per share (in dollars per share)									$ 0.365
Dividend payable, date to be paid									Mar. 14, 2018
Dividend payable, date of record									Feb. 26, 2018

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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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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Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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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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