Description of Business and Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018 USD ($)	Dec. 31, 2018 segments	Dec. 31, 2018	Dec. 31, 2018 number	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Goodwill [Line Items]
Number of Reporting Units				7	7
Description of Business [Abstract]
Number of Reportable Segments | segments			3
Cash and Cash Equivalents [Abstract]
Maturity Period Of Cash Equivalent (in months)	three months or less
Share-based Compensation [Abstract]
Vesting period (in years)	3 years
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 4,200
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent				0.60%		0.00%	0.00%
Research and Development [Abstract]
Research and Development Expense as a Percent of Revenue				0.020		0.019
Research and development expense		143,033				$ 130,536	$ 115,840
Advertising [Abstract]
Advertising expense		26,831				$ 33,369	$ 35,035
Risk, Retention, Insurance [Abstract]
Maximum Limit For Self Insurance Product Commercial General Liability Claims		5,000
Maximum Limit For Self Insurance Workers Compensation Claims Expected		800
Maximum Limit For Self Insurance Automobile Liability Claims		$ 5,000
Other Intangible Assets [Member] | Minimum [Member]
Goodwill [Line Items]
Other intangible assets, useful life	5 years
Other Intangible Assets [Member] | Maximum [Member]
Goodwill [Line Items]
Other intangible assets, useful life	15 years