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12. Segment Profit Reconciliation (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) $ 51,546,000 $ 73,308,000 $ 85,100,000 $ 127,674,000
Foreign exchange losses (gains), net (865,000) (1,619,000) (2,393,000) (3,060,000)
Other income (expense), net 8,644,000 6,731,000 10,044,000 13,181,000
Income before income taxes 47,661,000 66,019,000 70,110,000 112,198,000
Reportable Segment [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) 41,000,000 61,600,000 64,400,000 104,300,000
Unallocated Amount to Segment [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Foreign exchange losses (gains), net (900,000) (1,600,000) (2,400,000) (3,100,000)
Net corporate operating, interest and other expense not allocated to segments (1,000,000) (700,000) (1,900,000) (2,200,000)
Other income (expense), net $ 8,600,000 $ 6,700,000 $ 10,000,000 $ 13,200,000