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Postretirement Benefit Plans (Details)	5 Months Ended	7 Months Ended	12 Months Ended				19 Months Ended
	May 31, 2017 USD ($)	Dec. 31, 2018 USD ($) employee	Dec. 31, 2018 USD ($) employee	May 31, 2018 USD ($)	Dec. 31, 2017 USD ($) employee	Dec. 31, 2016 USD ($) employee	Dec. 31, 2016 USD ($) employee
Multiemployer Defined Contributory Trust Plan [Member]
Multiemployer Plans [Line Items]
Number of employees in plan | employee		1,221	1,221		1,365	1,369	1,369
Required employer's contribution per hour per active employee			$ 0.85		$ 0.80	$ 0.80
Required defined contributory trust contribution, percent of earnings			4.50%		4.50%	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		604	604		649	658	658
Required employer's contribution per hour per active employee	$ 5.80	$ 6.40		$ 6.10			$ 5.50
Period Contributions			$ 7,700,000		$ 8,100,000	$ 7,600,000

X

- Definition

Represents the number of employees in multiemployer plans.

+ References

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- Definition

Represents the required employer's contribution per hour per active employee.

+ References

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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

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X

- Definition

Amount of contributions made to multiemployer plan by employer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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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.

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