Nature of Business and Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (123,732)	$ (61,956)
Gains and (losses) netted against other income, net	(2,500)	200	$ (300)
Carrying value of demonstration units	36,800	39,600
Advertising costs	18,700	12,600	$ 10,700
Carrying value of cost-basis investments	$ 5,200	$ 13,500
Effect of stock-based compensation awards, shares excluded for purposes of diluted earnings per share	354	171	549
Unrecognized stock-based compensation costs, net of estimated forfeitures	$ 37,000
Weighted average period of unrecognized stock-based compensation costs, net of estimated forfeitures	1 year 11 months 1 day
Estimated forfeiture rate	5.00%
Level 1
Cash Equivalents, at Carrying Value	$ 29,000	$ 29,800
Time-vested restricted stock unit
Restricted stock units granted	804	685	1,173
Time-vested and performance-based restricted stock unit
Weighted average grant date fair value per share	$ 26.30	$ 32.80	$ 23.98
Market-based restricted stock unit
Total fair value of awards granted	$ 3,300
Restricted Stock Unit Awards
Total fair value of awards granted	$ 27,200	$ 22,484	$ 28,239
Market-based restricted stock unit [Member]
Restricted stock units granted	128
Weighted average grant date fair value per share	$ 25.55
Stock Option Awards
Weighted average grant date fair value per share	$ 5.60	$ 7.41	$ 5.92
Cash received from the exercise of stock options	$ 20,800	$ 44,200	$ 4,600
Related tax benefit realized from the exercise of the stock options	$ 3,900	$ 12,800	$ 600

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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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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