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2. Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Apr. 10, 2014
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired       100.00%
Goodwill   $ 503,588 $ 500,441  
GnuBIO [Member]        
Business Acquisition [Line Items]        
Indefinite-lived Intangible Assets Acquired $ 46,400      
Business Combination, Consideration Transferred 50,400      
Payments to Acquire Businesses, Gross $ 39,700      
Business Combination, Contingent Consideration, Liability   $ 10,000   $ 10,700
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       70,000
Goodwill       13,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net       $ (9,500)