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11. Segment Profit Reconciliation (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) $ 64,232,000 $ 73,922,000 $ 191,906,000 $ 209,226,000
Foreign exchange losses (gains), net (448,000) (6,346,000) (3,508,000) (12,132,000)
Other income (expense), net 1,511,000 538,000 14,692,000 5,907,000
Income before income taxes 53,394,000 55,773,000 165,592,000 161,853,000
Reportable Segment [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Segment profit (loss) 53,400,000 62,500,000 157,800,000 170,900,000
Unallocated Amount to Segment [Member]
        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Foreign exchange losses (gains), net (400,000) (6,300,000) (3,500,000) (12,100,000)
Net corporate operating, interest and other expense not allocated to segments (1,100,000) (900,000) (3,400,000) (2,800,000)
Other income (expense), net $ 1,500,000 $ 500,000 $ 14,700,000 $ 5,900,000