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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash paid during the period for:    
Interest $ 92 $ 234
Income taxes 352 472
Non-cash investing and financing activities:    
Acquisitions of property and equipment and other assets under extended payment terms $ 1,231 $ 2,457