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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 [Member]
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 1,650 $ 2,151 $ 793
Charged to Profit and Loss 1,381 3,518 3,118
Deduction from Reserves (1,283) (4,019) (1,760)
Balance at End of Period 1,748 1,650 2,151
Valuation Allowance of Deferred Tax Assets [Member]
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 926 105 470
Charged to Profit and Loss 14 872   
Deduction from Reserves    (51) (365)
Balance at End of Period $ 940 $ 926 $ 105