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DISCONTINUED OPERATIONS (Allowance for Doubtful Accounts) (Details) - Genetic Assays and Platforms and Patient Testing - Discontinued operations - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Disposal Group, Including Discontinued Operations, Allowance for Doubtful Accounts [Roll Forward]    
Beginning Balance $ 14,664 $ 7,927
Additions 0 1,532
Deductions (122) (286)
Ending Balance $ 14,542 $ 9,173