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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
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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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