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Supplemental Cash Flow Information (Schedule Of Supplemental Cash Flow Information) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Supplemental Cash Flow Information [Abstract]        
Income taxes paid, net $ 1,400 $ 3,602 $ 5,850 $ 6,961
Interest paid $ 313 $ 319 $ 633 $ 649