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Acquisitions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended
	Sep. 30, 2014 item	Sep. 30, 2014 Robtec [Member]	Apr. 16, 2014 Robtec [Member]	Jul. 30, 2014 Simbionix USA Corporation [Member]	Sep. 30, 2014 Simbionix USA Corporation [Member]	Aug. 06, 2014 Laser Reproductions [Member]	Sep. 30, 2014 Laser Reproductions [Member]	Aug. 13, 2014 American Precision Machining And American Precision Prototyping, LLC [Member]	Sep. 30, 2014 American Precision Machining And American Precision Prototyping, LLC [Member]	Sep. 03, 2014 LayerWise NV [Member]	Sep. 30, 2014 LayerWise NV [Member]
Business Acquisition [Line Items]
Number of businesses acquired	5
Date of acquisition					Aug. 28, 2014		Aug. 06, 2014		Aug. 13, 2014		Sep. 03, 2014
Date of acquisition agreement		Apr. 16, 2014
Fair value of the consideration paid				$ 121,562		$ 17,450		$ 14,089		$ 41,933
Cash paid for business acquisition						13,075
Value of shares paid for acquisition						$ 4,375
Business acquisition, ownership percentage			70.00%	100.00%						100.00%
Number years before purchasing remaining shares		5 years

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Number years before purchasing remaining shares.

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Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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