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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 01, 2019 USD ($) | Jun. 09, 2015 EUR (€)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | $ 84,884 | $ 119,050 | $ 84,884 | $ 121,665 | $ 81,692 |  |
Advertising and promotion expenses |  | 116,854 | 119,560 | 122,148 |  |  |
Co-op advertising expenses |  | $ 13,332 | 10,891 | 11,132 |  |  |
Minimum eligible service period (days) |  | 90 days |  |  |  |  |
Employer matching contribution, percent of match |  | 50.00% |  |  |  |  |
Maximum percentage of employee salary company matches at disclosed ratio |  | 6.00% |  |  |  |  |
Employee contributions |  | $ 55,796 | 53,544 | 50,542 |  |  |
Employer contributions to employee benefit plan |  | 22,689 | 22,039 | 21,002 |  |  |
Projected benefit obligation | 65,439 | 63,569 | 65,439 |  |  |  |
Projected plan assets | 53,404 | 54,315 | 53,404 |  |  |  |
Funded status of plan | 12,035 | 9,254 | 12,035 |  |  |  |
Purchases of short-term investments |  | 664,133 | 83,904 | 0 |  |  |
Net cash provided by operating activities |  | 1,181,344 | 1,193,595 | 1,345,289 |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Funded status of plan | 6,187 | 5,092 | 6,187 |  |  |  |
Other noncurrent liabilities |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Funded status of plan | 5,848 | 4,162 | 5,848 |  |  |  |
2.00% senior notes, payable January 14, 2022; interest payable annually |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of debts | € |  |  |  |  |  |  | € 500,000,000
Interest rate percentage |  |  |  |  |  |  | 2.00%
Change in U.S. dollar value of euro denominated debt |  | (27,948) | 74,112 | (20,644) |  |  |
Change in U.S. dollar value of euro denominated debt, net of tax |  | $ (20,376) | 46,320 | (12,902) |  |  |
Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite intangible assets useful life, minimum (years) |  | 7 years |  |  |  |  |
Minimum | Buildings and improvements |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives of property, plant and equipment, minimum (years) |  | 25 years |  |  |  |  |
Minimum | Machinery and equipment |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives of property, plant and equipment, minimum (years) |  | 5 years |  |  |  |  |
Minimum | Furniture and fixtures |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives of property, plant and equipment, minimum (years) |  | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite intangible assets useful life, minimum (years) |  | 16 years |  |  |  |  |
Maximum | Buildings and improvements |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives of property, plant and equipment, minimum (years) |  | 40 years |  |  |  |  |
Maximum | Machinery and equipment |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives of property, plant and equipment, minimum (years) |  | 15 years |  |  |  |  |
Maximum | Furniture and fixtures |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives of property, plant and equipment, minimum (years) |  | 7 years |  |  |  |  |
Non-US |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | 70,520 | $ 88,100 | 70,520 |  |  |  |
Accounting Standards Update 2016-09, Statutory Tax Withholding Component |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  | 13,039 | 11,589 |  |
Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  | $ 4,697 | $ 5,690 |  |
MAS |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Purchases of short-term investments |  | $ 53,000 | $ 83,904 |  |  |  |
MAS | Formation Of Wholly Owned Captive Insurance Company |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Initial cash contribution | 16,876 |  |  |  |  |  |
Contribution for net present value of insurance premiums | $ 67,391 |  |  |  |  |  |
Forecast | Accounting Standards Update 2016-02 | Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lease liability |  |  |  |  |  | $ 300,000 |
Right-of-use asset |  |  |  |  |  | 300,000 |
Forecast | Accounting Standards Update 2016-02 | Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lease liability |  |  |  |  |  | 350,000 |
Right-of-use asset |  |  |  |  |  | $ 350,000 |

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