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Supplemental Cash Flow Information (Supplemental Cash Flow Information) (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Supplemental Cash Flow Information        
Income taxes paid, net $ 3,602 $ 2,819 $ 6,961 $ 3,571
Interest paid $ 319 $ 327 $ 649 $ 663