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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
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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