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Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Aug. 01, 2018 | Aug. 01, 2017
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Amount of stock repurchase authorization |  |  |  |  |  |  |  |  |  | $ 200,000,000
Treasury Stock, Shares, Acquired |  |  |  |  |  |  | 1,608,537 |  |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  | $ 74,900,000 | $ 60,600,000 |  |
Amount remaining under stock repurchase authorization |  | $ 125,100,000 |  |  |  |  | $ 125,100,000 |  |  |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  | $ 0.125 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.375 | $ 0.30 |  |
Cash dividends paid per common share (in dollars per share) |  | $ 0.125 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Amount of stock repurchase authorization |  |  |  |  |  |  |  |  | $ 400,000,000 |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.125 |  |  |  |  |  |  |  |  |

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- Definition The cash outflow to reacquire common stock during the period. + 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 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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