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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Changes to valuation allowance      
Balance at beginning of period $ 23,776    
Balance at end of period 27,544 $ 23,776  
Allowance for doubtful accounts, sales returns and cash discounts      
Changes to valuation allowance      
Balance at beginning of period 1,704 2,926 $ 1,430
Charged to cost and expenses 8,407 2,652 4,894
Deductions (8,863) (3,874) (3,398)
Balance at end of period 1,248 1,704 2,926
Allowance on Deferred Tax Assets      
Changes to valuation allowance      
Balance at beginning of period 19,786 24,130 12,579
Charged to cost and expenses (1,940) (4,344) 11,551
Balance at end of period $ 17,846 $ 19,786 $ 24,130