Goodwill And Intangible Assets Goodwill And Intangible Assets (Fair Value Measurement) (Details)	12 Months Ended
	Dec. 31, 2018 Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Period of cash flow before terminal value	5 years
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average Discount Rate, Percent	13.00%
Market Multiple	850.00%
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average Discount Rate, Percent	12.00%
Market Multiple	700.00%