Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Impairment charges	$ 43,205,000
Finite-lived intangible assets, gross	786,212,000		784,604,000
Goodwill	1,171,077,000us-gaap_Goodwill		1,323,502,000us-gaap_Goodwill
Amortization of intangible assets	22,000,000us-gaap_AmortizationOfIntangibleAssets	19,000,000us-gaap_AmortizationOfIntangibleAssets
Developed Technology [Member]
Finite-lived intangible assets, gross	512,502,000		512,402,000
Customer Relationships [Member]
Finite-lived intangible assets, gross	149,194,000		148,338,000
MakerBot [Member]
Impairment charges	43,200,000		102,500,000
Non-tax deductible impairment charge	150,400,000
Percentage of decrease in growth rate	1.00%
Percentage of increase in discount rate	1.00%
Change in fair value due to 1% decrease in growth rate	18,900,000
Change in fair value due to 1% increase in discount rate	29,600,000
Goodwill	0
MakerBot [Member] \| Level 3 [Member]
Growth rate (as a percent)	3.50%
Discount rate (as a percent)	13.50%
MakerBot [Member] \| Developed Technology [Member]
Impairment charges	29,800,000
MakerBot [Member] \| Customer Relationships [Member]
Impairment charges	$ 13,400,000

Represents the amount of change in fair value of reporting unit due to 1 percent decrease in growth rate.

No definition available.

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Represents the amount of change in fair value of reporting unit due to 1 percent increase in discount rate.

+ References

No definition available.

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Represents the percentage of decrease in growth rate.

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Represents the percentage of increase in discount rate.

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No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB

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- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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