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Operations and Summary of Significant Accounting Policies Operations and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - Accounting Standards Update 2016-09 - USD ($) $ in Millions | Dec. 31, 2017 | Jan. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Adjustment related to the adoption of ASU 2016-09 | $ (1.7) |
Retained Earnings |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Adjustment related to the adoption of ASU 2016-09 |  | $ (1.7)

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