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Stockholders' Equity (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Equity, Class of Treasury Stock [Line Items] |  |
Treasury stock shares | 1.1 | 1.2
Treasury stock, Cost basis | $ 24.4 | $ 25.5
Restricted Stock [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Number of shares nonvested | 1.5 | 1.5

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- Definition Cost basis for treasury stock acquired for purposes other than retirement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + 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 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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