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Commitments and Contingencies - Asbestos Claimant and Settlement (Details) - Asbestos [Member]	12 Months Ended
	Dec. 31, 2017 USD ($) claimants	Dec. 31, 2016 USD ($) claimants	Dec. 31, 2015 USD ($) claimants
Loss Contingencies [Line Items]
Number of pending claims at the beginning of period	5,339	6,242	7,992
Number of pending claims filed during period	173	140	266
Number of pending claims dismissed during period	231	1,009	1,990
Number of pending claims settled during period	25	34	26
Average settlement amount per claim during period | $	$ 8,930	$ 15,624	$ 16,963
Total defense costs during period | $	$ 2,280,000	$ 2,920,000	$ 3,160,000

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- Definition

Number of Plaintiffs who had their claims dismissed during the period.

+ References

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- Definition

Number of Plaintiffs who had their claims settled during the period.

+ References

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- Definition

Loss Contingency, Number of New Plaintiffs Filing Claims During Period

+ References

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- Definition

Average amount of consideration the entity has agreed to pay to settle a legal matter for claims settled during the period.

+ References

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- Definition

Number of pending claims at the beginning of period

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- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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.

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