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Profit Sharing Plan and Annual Cash Bonuses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred Compensation Arrangements [Abstract] |  |  |
Maximum percentage of compensation employee is allowed to contribute | 15.00% |  |
Matching contributions | $ 8.2 | $ 8.5 | $ 8.0
Bonus expense, cash | $ 16.8 | $ 20.7 | $ 19.1

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- Definition Individual Employees, Bonus Expense, Cash + References No definition available. + Details
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- Definition Maximum percentage of compensation employee is allowed to contribute to the Plan. + References No definition available. + Details
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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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