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11. Segment Profit Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Research and Development Asset Acquired Other than Through Business Combination, Written-off $ 7,500      
Income before income taxes 1,120 $ 26,864 $ 21,267 $ 47,059
Operating Segments [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income before income taxes (4,900) 18,500 17,500 40,300
Corporate, Non-Segment [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income before income taxes (3,300) (1,600) (5,100) (3,200)
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 (2,500) (1,200) (4,300) (2,400)
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 $ 11,800 $ 11,200 $ 13,200 $ 12,400