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Stockholders' Equity - Cash Dividends Declared - Common Stock (Details) - $ / shares | 3 Months Ended
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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

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- 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 + Details
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- 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 + Details
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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 + Details
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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. + Details
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