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New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2017
New Accounting Pronouncements [Abstract] |  |
Deferred lease costs amount related to salaries and related costs | $ 4.3 | $ 6.1

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