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Equity Investments (Details) (USD $)
6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2013
BioClinica, Inc.
Jun. 30, 2013
Caprion Proteomics
Disclosures on investments        
Proceeds from sale of investment $ 0 $ 17,781,000 $ 17,100,000  
Cost basis of investment     1,400,000  
Gain on sale of investment     15,700,000  
Gain on sale of investment, net of tax     10,200,000  
Gain on sale of investment       $ 700,000