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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for doubtful accounts:
      
The roll forward of valuation accounts were as follows:      
Balance at beginning of period $ 1,912 $ 1,085 $ 882
Charged to costs and expenses 1,556 1,500 883
Deductions (1,781) [1] (673) [1] (680) [1]
Balance at end of period 1,687 1,912 1,085
Allowance for excess and obsolete inventory:
      
The roll forward of valuation accounts were as follows:      
Balance at beginning of period 5,046 4,711 4,748
Charged to costs and expenses 4,246 1,103 110
Deductions (746) [2] (768) [2] (147) [2]
Balance at end of period 8,546 5,046 4,711
Valuation allowance for deferred tax assets:
      
The roll forward of valuation accounts were as follows:      
Balance at beginning of period 938 875 1,744
Charged to costs and expenses 33,340 63 0
Deductions 0 0 (869) [3]
Balance at end of period $ 34,278 $ 938 $ 875
[1] Uncollected receivables written off, net of recoveries and translation adjustment.
[2] Disposal of excess and obsolete inventory and translation adjustment.
[3] Capital loss carryforward written off.