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Basis of Presentation Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2018 | Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification of stranded tax effects | [1] |  | $ 0
Accounting Standards Update 2018-02 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification of stranded tax effects |  | $ 7,100 |
[1] | Result of adoption of ASU 2018-02, See Note 1 to Consolidated Financial Statements for further details.

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