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14. Segment Information Segment Profit Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Goodwill, Impairment Loss $ 282,000 $ 11,500  
Income before income taxes 512,659 97,805 $ 41,560
Unrealized Gain on Securities 606,230 0 0
Operating Segments [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Income before income taxes (116,800) 106,300 39,800
Segment Reconciling Items [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Unrealized Gain on Securities 606,200 0 0
Corporate, Non-Segment [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Income before income taxes (10,400) (10,100) (7,500)
Foreign Currency Gain (Loss) [Member] | Segment Reconciling Items [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Income before income taxes (2,900) (9,100) (4,500)
Other Nonoperating Income (Expense) [Member] | Segment Reconciling Items [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Income before income taxes 36,600 10,700 $ 13,800
Clinical Diagnostics [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Goodwill, Impairment Loss $ 276,100 $ 2,800