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Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | $ 1.7 |
Retained Earnings [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | $ 1.7 |
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption |  | $ 1.7

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