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Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	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

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of cost for defined contribution plan.

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