Other Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Accrued Expenses (Tables) [Abstract]
Sales returns and allowances	$ 36,688	$ 34,479
Goods received, not yet invoiced	39,221	30,987
Restructuring reserve, current	7,352	12,655
Other	72,769	71,010
Total other accrued expenses	$ 156,030	$ 149,131