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Acquisitions (Fiscal Year 2012 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
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
Dec. 31, 2013
Intial Lease Term [Member]
Dec. 31, 2013
Successive Lease Term [Member]
item
Jan. 03, 2012
Z Corporation And Vidar Systems Corporation [Member]
Dec. 31, 2013
Z Corporation And Vidar Systems Corporation [Member]
Dec. 31, 2012
Z Corporation And Vidar Systems Corporation [Member]
Dec. 31, 2011
Z Corporation And Vidar Systems Corporation [Member]
Apr. 05, 2012
Fresh Fiber B.V. [Member]
Dec. 31, 2013
Fresh Fiber B.V. [Member]
Apr. 10, 2012
Kodama Studios, LLC [Member]
Dec. 31, 2013
Kodama Studios, LLC [Member]
Apr. 17, 2012
Paramount Industries [Member]
Dec. 31, 2013
Paramount Industries [Member]
May 23, 2012
Bespoke Innovations, Inc. [Member]
Dec. 31, 2013
Bespoke Innovations, Inc. [Member]
Jul. 23, 2012
Viztu Technologies, Inc. [Member]
Dec. 31, 2013
Viztu Technologies, Inc. [Member]
Oct. 02, 2012
TIM Innovative Modelmakers B.V. [Member]
Dec. 31, 2013
TIM Innovative Modelmakers B.V. [Member]
Oct. 09, 2012
INUS Technology, Inc. [Member]
Dec. 31, 2013
INUS Technology, Inc. [Member]
Business Acquisition [Line Items]                                                              
Date of acquisition                             Jan. 03, 2012       Apr. 05, 2012   Apr. 10, 2012   Apr. 17, 2012   May 23, 2012   Jul. 23, 2012   Oct. 01, 2012   Oct. 09, 2012
Business acquisition, ownership percentage                           100.00%       100.00%   100.00%       100.00%   100.00%   100.00%   100.00%  
Fair value of the consideration paid                           $ 134,918       $ 1,243   $ 2,749   $ 7,953   $ 7,903   $ 1,000   $ 1,714   $ 33,918  
Cash paid for business acquisition                                   848   1,499   6,138   4,064   500   1,148      
Value of shares paid for acquisition                                   395   1,250   1,815   3,144   500   566      
Revenue 154,817 135,717 120,787 102,079 101,571 90,532 83,610 77,920 513,400 353,633 230,423         55,637                              
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         8,478                              
Pro forma revenue                               353,633 286,956                            
Pro forma net income (loss)                               38,941 27,487                            
Maximum earnout payment $ 4,500               $ 4,500                             $ 695   $ 1,000          
Business acquisition agreement, period                                   3 years       5 years       4 years          
Lease term                       5 years 3 years                                    
Number of successive lease terms                         2