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Acquisitions (Fiscal Year 2011 Acquisitions) (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jan. 05, 2011
National RP Support, Inc. [Member]
Dec. 31, 2013
National RP Support, Inc. [Member]
Feb. 22, 2011
Quickparts.com, Inc. [Member]
Dec. 31, 2013
Quickparts.com, Inc. [Member]
Dec. 31, 2011
Quickparts.com, Inc. [Member]
Dec. 31, 2010
Quickparts.com, Inc. [Member]
Mar. 08, 2011
Accelerated Technologies, Inc. [Member]
Dec. 31, 2013
Accelerated Technologies, Inc. [Member]
May 31, 2011
Print3D Corporation [Member]
Apr. 13, 2011
Print3D Corporation [Member]
Dec. 31, 2013
Print3D Corporation [Member]
Apr. 15, 2011
Sycode [Member]
Dec. 31, 2013
Sycode [Member]
May 06, 2011
The3dStudio.com, Inc. [Member]
Dec. 31, 2013
The3dStudio.com, Inc. [Member]
May 12, 2011
Freedom Of Creation [Member]
Dec. 31, 2013
Freedom Of Creation [Member]
Jul. 19, 2011
Alibre Inc. [Member]
Dec. 31, 2013
Alibre Inc. [Member]
Aug. 09, 2011
Content Media, Inc. [Member]
Dec. 31, 2013
Content Media, Inc. [Member]
Sep. 20, 2011
Formero Pty, Ltd. [Member]
Dec. 31, 2013
Formero Pty, Ltd. [Member]
Oct. 04, 2011
Kemo Modelmakerij B.V. [Member]
Dec. 31, 2013
Kemo Modelmakerij B.V. [Member]
Nov. 30, 2011
Advanced Materials Division of Huntsman Corporation [Member]
Dec. 31, 2013
Advanced Materials Division of Huntsman Corporation [Member]
Business Acquisition [Line Items]                                                                            
Date of acquisition                         Jan. 05, 2011   Feb. 22, 2011       Mar. 08, 2011     Apr. 13, 2011   Apr. 14, 2011   May 06, 2011   May 12, 2011   Jul. 19, 2011   Aug. 09, 2011   Sep. 20, 2011   Oct. 04, 2011   Nov. 01, 2011
Business acquisition, ownership percentage                           100.00%                         100.00%           100.00%   100.00%      
Fair value of the consideration paid                       $ 5,550   $ 22,775       $ 1,000     $ 1,250   $ 500   $ 2,500   $ 2,286   $ 3,800   $ 17   $ 5,967   $ 3,719   $ 41,286  
Cash paid for business acquisition                                         1,000       1,875   1,136           4,967          
Value of shares paid for acquisition                                         250       625   1,150           1,000          
Revenue 154,817 135,717 120,787 102,079 101,571 90,532 83,610 77,920 513,400 353,633 230,423         24,127                                            
Operating income (loss) 17,976 28,570 16,796 17,519 18,166 18,436 13,999 9,970 80,861 60,571 34,902         2,799                                            
Pro forma revenue                               233,612 185,055                                          
Pro forma net income (loss)                               34,144 20,102                                          
Maximum earnout payment $ 4,500               $ 4,500                       $ 8,925                   $ 1,000   $ 2,012          
Business acquisition agreement, period                                       36 months                     3 years   3 years