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Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract] |  |
Legal Fees In Responding to Department Of Justice Inquiry | $ 2.1 | $ 10.6

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