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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Contributions based on wages paid to covered employees | $ 1.7 | $ 1.6 | $ 1.5
Voluntary contributions to the 401(k) profit-sharing plans and trusts | $ 4.3 | $ 4.4 | $ 3.9

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