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New Accounting Standards ASU 2016-09 (Details) - USD ($) $ in Millions | 6 Months Ended |
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Jun. 30, 2017 | Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Description | no material impact |
Retained Earnings [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative Effect from Adoption of new accounting for stock-based compensation | $ 1.3 | $ 1.3

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