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Savings, Pension and Other Postretirement Employee Benefit Plans Multiemployer Defined Benefit Plans (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plans, Withdrawal Obligation		$ 78,000
Entity Tax Identification Number		516031295
Contributions (in thousands)		$ 6,148	$ 6,014	$ 5,960
IAM
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan Number		002
Multiemployer Plans, Certified Zone Status		Green	Green
Contributions (in thousands)		$ 333	$ 335	329
Multiemployer Plans, Surcharge		No
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date		May 31, 2018
USW
Defined Benefit Plan Disclosure [Line Items]
Entity Tax Identification Number		116166763
Multiemployer Plan Number		001
Multiemployer Plans, Certified Zone Status	[1]	Red	Red
Contributions (in thousands)		$ 5,815	$ 5,679	$ 5,631
Multiemployer Plans, Surcharge		No
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date		Aug. 31, 2017
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year		7.40%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		6.70%
Maximum [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		4.00%
[1] PIUMPF has been certified as in "Critical and Declining Status" for 2017 and 2016, under the provisions of the Multiemployer Pension Plan Reform Act of 2014.

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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12b
-Subsection 1

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Health Care Cost Trend Rate
-URI http://asc.fasb.org/extlink&oid=6514820

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
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The ultimate trend rate for health care costs.

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-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Three digit plan number for 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.

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-SubTopic 80
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-Paragraph 5
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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.

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Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". 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.

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Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, in CCYY-MM-DD format. 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.

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Indicate whether the employer paid a surcharge to the 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. The acceptable values are "no", "yes", and "NA".

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Amount of the obligation recognized by withdrawing from 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.

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