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11. Segment Profit Reconciliation (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) $ 73,308,000 $ 68,186,000 $ 127,674,000 $ 135,304,000
Foreign exchange losses (gains), net (1,619,000) (2,744,000) (3,060,000) (5,786,000)
Other income (expense), net 6,731,000 4,418,000 13,181,000 5,369,000
Income before income taxes 66,019,000 57,819,000 112,198,000 106,080,000
Reportable Segment [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) 61,600,000 57,100,000 104,300,000 108,400,000
Unallocated Amount to Segment [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Foreign exchange losses (gains), net (1,600,000) (2,700,000) (3,100,000) (5,800,000)
Net corporate operating, interest and other expense not allocated to segments (700,000) (1,000,000) (2,200,000) (1,900,000)
Other income (expense), net $ 6,700,000 $ 4,400,000 $ 13,200,000 $ 5,400,000