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Description of Business and Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended
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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 |  |  |  |  |  |

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