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11. Segment Profit Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Income before income taxes $ 20,147 $ 20,195
Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Income before income taxes 22,400 21,800
Corporate, Non-Segment [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Income before income taxes (1,900) (1,700)
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 (1,800) (1,100)
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 $ 1,200