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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
Allowance for doubtful accounts, sales returns and cash discounts
      
Changes to valuation allowance      
Balance at beginning of period $ 1,430 $ 1,893 $ 1,870
Charged to cost and expenses 4,894 9,148 8,368
Deductions (3,398) (9,611) (8,345)
Balance at end of period 2,926 1,430 1,893
Allowance on Deferred Tax Assets
      
Changes to valuation allowance      
Balance at beginning of period 12,579 7,592 4,003
Charged to cost and expenses 11,551 6,142 3,589
Deductions   (1,155)  
Balance at end of period $ 24,130 $ 12,579 $ 7,592