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Equity - Reincorporation, Common Stock (Details)	1 Months Ended				12 Months Ended
	Feb. 28, 2018 $ / shares	Feb. 28, 2017 $ / shares	Jul. 31, 2016 $ / shares	Feb. 28, 2015 $ / shares	Dec. 31, 2017 item $ / shares	Dec. 31, 2016 $ / shares	Dec. 31, 2015 $ / shares
Common Stock
Preferred stock, par value (in dollars per share)					$ 0.001	$ 0.001
Common stock, par value (in dollars per share)					$ 0.001	0.001
The number of consecutive years the company has paid regular common stock quarterly dividends. | item					58
Votes per share of common stock | item					1
Common stock quarterly dividend per share (in dollars per share)	$ 0.50	$ 0.45	$ 0.425	$ 0.40	$ 1.80	$ 1.65	$ 1.60

X

- Definition

The number of votes per share of common stock on all matters except the election of members to the Board of Directors.

+ References

No definition available.

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X

- Definition

The number of consecutive years the company has paid regular common stock quarterly dividends.

+ References

No definition available.

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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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- References

No definition available.

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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