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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year $ 4,246,000 $ 6,369,000 $ 6,969,000
Charged to costs and expenses 10,988,000 13,243,000 13,071,000
Other 0 0 0
Deductions 10,809,000 15,366,000 13,671,000
Balance at end of year 4,425,000 4,246,000 6,369,000
Allowance for doubtful accounts receivable, pre-tax charge 800,000 3,514,000  
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 3,201,000 4,894,000 5,528,000
Charged to costs and expenses 949,000 3,371,000 [1] (497,000)
Other 0 0 0
Deductions 797,000 5,064,000 137,000
Balance at end of year 3,353,000 3,201,000 4,894,000
Allowance for Discounts [Member]      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 1,045,000 1,475,000 1,441,000
Charged to costs and expenses 10,039,000 9,872,000 13,568,000
Other 0 0 0
Deductions 10,012,000 10,302,000 13,534,000
Balance at end of year 1,072,000 1,045,000 1,475,000
Allowance for Sales Returns [Member]      
Valuation and Qualifying Accounts [Roll Forward]      
Balance at beginning of year 38,812,000 30,621,000 31,464,000
Charged to costs and expenses 138,407,000 133,355,000 126,608,000
Other 0 0 0
Deductions 137,043,000 125,164,000 127,451,000
Balance at end of year $ 40,176,000 $ 38,812,000 $ 30,621,000
[1] Includes a net $3,514,000 charge relating to one of our customers that filed a petition for bankruptcy in January 2016.