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Discontinued Operations (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Summary of balance sheet data for discontinued operations    
Cash $ 304 $ 754
Accounts receivable 9 434
Inventory 1,017 1,077
Other current assets 2,683 3,653
Total current assets associated with discontinued operations 4,013 5,918
Property, plant and equipment, net   502
Other long-term assets   8,670
Total assets associated with discontinued operations 4,013 15,090
Accounts payable 589 801
Accrued liabilities 4,295 13,932
Deferred revenues 1,499 821
Total current liabilities associated with discontinued operations 6,383 15,554
Other long-term liabilities 14,140 13,111
Total liabilities associated with discontinued operations $ 20,523 $ 28,665