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14. Segment Information Segment Profit Reconciliation (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segment profit $ 257,200,000 $ 295,156,000 $ 284,009,000
Foreign exchange losses 5,040,000 13,842,000 3,884,000
Other income (expense), net 21,883,000 7,583,000 3,875,000
Income before income taxes 222,931,000 235,762,000 220,283,000
Reportable Segment [Member]
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segment profit 210,800,000 244,800,000 223,900,000
Unallocated Amount to Segment [Member]
      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Foreign exchange losses 5,000,000 13,800,000 3,900,000
Net corporate operating, interest and other expense, net not allocated to segments 4,800,000 2,800,000 3,600,000
Other income (expense), net $ 21,900,000 $ 7,600,000 $ 3,900,000