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Schedule II-Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 5,200 $ 2,233 $ 2,156
Charged to Costs and Expenses 4,366 3,141  
Charged to Other Accounts 625    
Deductions   (174) 77
Balance at End of Period 10,191 5,200 2,233
Allowance for doubtful accounts
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 492 468 512
Charged to Costs and Expenses 1,946 198  
Deductions   (174) (44)
Balance at End of Period 2,438 492 468
Valuation allowance in net deferred tax assets
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 4,708 1,765 1,644
Charged to Costs and Expenses 2,420 2,943  
Charged to Other Accounts 625    
Deductions     121
Balance at End of Period $ 7,753 $ 4,708 $ 1,765