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Stock Based Compensation Profit Sharing Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract] |  |  |
Defined Benefit Plan, Contributions by Employer | $ 1.4 | $ 1.2 | $ 1.0

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