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Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Effective income tax rate reconciliation, excess tax benefit, amount | $ 1.2 |  | $ 5.4 |
Increased in diluted weighted average common shares outstanding (in shares) | 1,061 | 815 | 989 | 835
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increased in diluted weighted average common shares outstanding (in shares) | 198 |  | 174 |

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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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