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Benefit Plans (Details) $ in Millions | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) plan | Dec. 31, 2017 USD ($) plan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Number of defined-contribution 401(k) plans | plan | 2 | 2 |  |
Percentage of employer match |  | 100.00% |  |
Percent of employees' gross pay matched |  | 6.00% |  |
Vesting schedule for employer's matching funds |  | 3 years |  |
Matching contributions made by the company |  | $ 8.5 | $ 8.1 | $ 7.3
Union Plan |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Matching contributions made by the company | $ 0.0 |  |  |

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- Definition Represents the period over which the matching contributions vest under the defined contribution plan. + References No definition available. + Details
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- Definition Represents the number of defined-contribution 401(k) plans. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- 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. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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