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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | May 24, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock shares | 900,000 | 900,000 |
Treasury stock, Cost basis | $ 16.6 | $ 18.5 |
2018 Stock Buyback Program [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares authorized for repurchase |  |  | 5.00%
Number of shares authorized for repurchase |  |  | 4,300,000
Shares repurchased | 200,000 |  |
Shares purchased price per share | $ 41.30 |  |
Restricted Stock [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares nonvested | 1,300,000 | 1,300,000 |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury 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(28)) -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 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: 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 4: 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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