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11. Segment Profit Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income before income taxes $ 22,688 $ 25,415 $ 69,747 $ 91,649
Operating Segments [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income before income taxes 24,300 28,300 64,600 96,100
Corporate, Non-Segment [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income before income taxes (1,800) (1,400) (5,100) (4,600)
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 (1,200) (2,200) (3,600) (8,900)
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 $ 1,400 $ 700 $ 13,800 $ 9,000