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Postretirement Benefit Plans (Details) - Multiemployer Health and Welfare Plan [Member] | 12 Months Ended | 17 Months Ended | 19 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 USD ($) employee | Dec. 31, 2015 USD ($) employee | May 31, 2015 USD ($) | Dec. 31, 2014 USD ($) employee | May 31, 2014 USD ($) | Dec. 31, 2016 USD ($) employee
Multiemployer Plans [Line Items] |  |  |  |  |  |
Number of employees in plan | employee | 658 | 651 |  | 652 |  | 658
Required employer's contribution per hour per active employee |  |  | $ 5.25 |  | $ 5.00 | $ 5.50
Period Contributions | $ 7,600,000 | $ 7,600,000 |  | $ 7,300,000 |  |

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- Definition Represents the number of employees in multiemployer plans. + References No definition available. + Details
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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 Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit 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 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 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 3: 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 + 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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- Details
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Balance Type: |
Period Type: |