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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Cash paid (received) during the period for:    
Interest Expense $ 3,769 $ 2,034
Interest income (368) (455)
Income taxes, net of refunds received 18,334 20,619
Supplemental non-cash investing and financing activities:    
Accounts payable for purchase of fixed assets $ 5,993 $ 6,130