Nature of Business and Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (148,406)	$ (113,012)
Gains and (losses) netted against other income, net	(1,300)	(200)	$ (2,200)
Other Inventory, Demo, Gross	35,200	37,600
Advertising costs	12,500	19,200	$ 19,300
Carrying value of cost-basis investments	$ 17,069	$ 3,100
Effect of stock-based compensation awards, shares excluded for purposes of diluted earnings per share	10	39	233
Unrecognized stock-based compensation costs, net of estimated forfeitures	$ 48,100
Weighted average period of unrecognized stock-based compensation costs, net of estimated forfeitures	2 years
Estimated forfeiture rate	5.00%
Net cash provided by operating activities	$ 374,157	$ 308,252	$ 319,751
Net cash (used) provided by financing activities	(318,944)	(132,612)	31,136
Excess Tax Benefit from Share-based Compensation, Financing Activities	(16,228)	(10,731)	$ (5,991)
Level 1
Cash equivalents at fair value	$ 200,000	$ 140,700
Time-vested restricted stock unit
Restricted stock units granted	594	773	865
Time-vested and performance-based restricted stock unit
Weighted average grant date fair value per share	$ 52.93	$ 36.20	$ 29.48
Performance-based restricted stock unit [Domain]
Total fair value of awards granted	$ 9,200		$ 1,600
Restricted Stock Unit Awards
Total fair value of awards granted	$ 40,675	$ 37,906	$ 28,603
Market-based restricted stock unit
Restricted stock units granted			64
Weighted average grant date fair value per share			$ 22.89
Total fair value of awards granted			$ 1,500
Performance-based restricted stock unit [Member]
Restricted stock units granted	177	283	62
Weighted average grant date fair value per share	$ 52.32	$ 35.08	$ 26.41
Total fair value of awards granted		$ 9,900
Stock Option Awards
Cash received from the exercise of stock options	$ 23,700	53,500	$ 7,700
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 8,700	$ 3,000	$ 1,300

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Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Grants in Period, Aggregate Fair Value

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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