GEOGRAPHIC INFORMATION - Net sales by region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Sales:
Net Sales	$ 105,834	$ 87,346	$ 190,784	$ 182,303
North America
Net Sales:
Net Sales	89,843	71,418	162,111	150,267
Foreign Countries
Net Sales:
Net Sales	$ 15,991	$ 15,928	$ 28,673	$ 32,036