Significant Accounting Policies - Intangible Asset Depreciation and Amortization Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2017
Patents
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	11 years
Patents | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	5 years
Patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	17 years
Trade Names
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	16 years
Trade Names | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years
Trade Names | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	20 years
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	13 years
Customer Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	6 years
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	20 years
Unpatented technology and other
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	13 years
Unpatented technology and other | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	6 years
Unpatented technology and other | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	20 years