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Stockholders' Equity - Cash Dividends Declared - Common Stock (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Stockholders' Equity Note [Abstract]
Declaration Date	Mar. 19, 2018	Dec. 07, 2017	Sep. 14, 2017	Jun. 14, 2017	Mar. 16, 2017
Record Date	Mar. 29, 2018	Dec. 18, 2017	Sep. 25, 2017	Jun. 26, 2017	Mar. 27, 2017
Payment Date	Apr. 26, 2018	Jan. 25, 2018	Oct. 25, 2017	Jul. 25, 2017	Apr. 25, 2017
Cash dividend per share (in dollars per share)	$ 0.2	$ 0.2	$ 0.2	$ 0.2	$ 0.20

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

- Definition

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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- Definition

Date the dividend to be paid was declared, 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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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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- References

No definition available.

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