Annual report pursuant to Section 13 and 15(d)

Valuation and Qualifying Accounts (Details)

v3.8.0.1
Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 8,556 $ 9,928 $ 8,943
Charged to Costs and Expenses 3,296 2,037 2,788
Deductions [1] (3,174) (3,406) (1,239)
Valuation Allowances and Reserves, Adjustments [2] 365 (3) (564)
Balance at End of Period 9,043 8,556 9,928
Allowance For Sales Returns And Miscellaneous Claims [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 39,768 40,510 27,379
Charged to Costs and Expenses 80,116 49,822 54,017
Deductions [1] (75,066) (50,548) (40,022)
Valuation Allowances and Reserves, Adjustments [2] 1,488 (16) (864)
Balance at End of Period $ 46,306 $ 39,768 $ 40,510
[1] Charges to the accounts included in this column are for the purposes for which the reserves were created.
[2] Amounts included in this column primarily relate to foreign currency translation.