Use of Estimates and Summary of Significant Accounting Policies (Intangible Assets, Useful Lives) (Details)	12 Months Ended
	Dec. 31, 2017 reporting_unit
Finite-Lived Intangible Assets [Line Items]
Number of reporting units for goodwill impairment test purposes	1
Developed technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset useful life	11 years
Developed technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset useful life	13 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset useful life	10 years