Basis of Presentation Basis of Presentation-Additional Information (Details)	Jun. 30, 2018 USD ($) shares	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)
Business Acquisition [Line Items]
Assets Held-for-sale, Property, Plant and Equipment \| $	$ 17,400,000	$ 5,300,000	$ 0
ARX Holding Corp. [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage	86.70%	69.00%	69.00%
Number of Shares Put Pursuant to Stockholders' Agreement \| shares	204,527

Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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