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Postretirement Benefit Plans (Details) | 5 Months Ended | 7 Months Ended | 12 Months Ended | 19 Months Ended
--- | --- | --- | --- | ---
May 31, 2017 USD ($) | Dec. 31, 2017 USD ($) employee | Dec. 31, 2017 USD ($) employee | Dec. 31, 2016 USD ($) employee | Dec. 31, 2015 USD ($) employee | May 31, 2015 USD ($) | Dec. 31, 2016 USD ($) employee
Multiemployer Defined Contributory Trust Plan [Member] |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |
Number of employees in plan | employee |  | 1,365 | 1,365 | 1,369 | 1,431 |  | 1,369
Required employer's contribution per hour per active employee |  |  | $ 0.80 | $ 0.80 | $ 0.75 |  |
Required defined contributory trust contribution, percent of earnings |  |  | 4.50% | 4.00% | 4.00% |  |
Period Contributions |  |  | $ 2,800,000 | $ 2,800,000 | $ 2,800,000 |  |
Multiemployer Health and Welfare Plan [Member] |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |
Number of employees in plan | employee |  | 649 | 649 | 658 | 651 |  | 658
Required employer's contribution per hour per active employee | $ 5.80 | $ 6.10 |  |  |  | $ 5.25 | $ 5.50
Period Contributions |  |  | $ 8,100,000 | $ 7,600,000 | $ 7,600,000 |  |

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- Definition Represents the required employer's contribution per hour per active employee. + References No definition available. + Details
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- Definition Percentage of contributions required of employer under collective bargaining arrangement to total contributions required under all collective bargaining arrangements for pension and other postretirement plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Amount of contributions made to multiemployer plan by employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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- Details
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