Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 09, 2015 EUR (€)	Dec. 31, 2014 USD ($)
Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 84,884	$ 84,884	$ 121,665	$ 81,692		$ 97,877
Advertising and promotion expenses		119,560	122,148	100,012
Co-op advertising expenses		$ 10,891	11,132	9,417
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		$ 53,544	50,542	45,279
Employer contributions to employee benefit plan		22,039	21,002	18,882
Projected benefit obligation	65,439	65,439	48,117
Projected plan assets	53,404	53,404	40,600
Funded status of plan	12,035	12,035	7,517
Purchases of short-term investments		(83,904)	0	0
Net cash provided by operating activities		1,193,595	1,345,289	929,152
Accumulated other comprehensive income (loss)
Significant Accounting Policies [Line Items]
Funded status of plan	6,187	6,187	3,803
Other noncurrent liabilities
Significant Accounting Policies [Line Items]
Funded status of plan	5,848	5,848	3,714
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		74,112	(20,644)	18,025
Change in U.S. dollar value of euro denominated debt, net of tax		$ 46,320	(12,902)	11,266
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	$ 70,520	92,419
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 | 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