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Segment Reporting (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Reconciliation of earnings before taxes to segment profit    
Earnings before taxes $ 69,308 $ 63,278
Amortization (5,199) (3,622)
Interest expense (5,823) (5,711)
Restructuring charges (308) (498)
Other charges (income), net 156 669
Segment Profit Information $ 80,794 $ 73,778