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11. Segment Profit Reconciliation (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total segment profit $ 68,186,000 $ 68,176,000 $ 135,304,000 $ 131,423,000
Foreign exchange losses (gains), net (2,744,000) (1,014,000) (5,786,000) (797,000)
Other income (expense), net 4,418,000 2,517,000 5,369,000 3,316,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 57,819,000 55,354,000 106,080,000 105,173,000
Reportable Segment [Member]
       
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total segment profit 57,100,000 54,700,000 108,400,000 104,300,000
Unallocated Amount to Segment [Member]
       
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Foreign exchange losses (gains), net (2,700,000) (1,000,000) (5,800,000) (800,000)
Net corporate operating, interest and other expense not allocated to segments (1,000,000) (800,000) (1,900,000) (1,600,000)
Other income (expense), net $ 4,400,000 $ 2,500,000 $ 5,400,000 $ 3,300,000