SEGMENT INFORMATION - Revenue and Long-Lived Assets by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 159,264	$ 150,716	$ 147,082	$ 137,728	$ 140,760	$ 138,509	$ 138,794	$ 135,141	$ 594,790	$ 553,204	$ 552,492
Long-lived assets, excluding intangible assets [Abstract]
Long-lived assets, excluding intangible assets	189,793				165,754				189,793	165,754	158,515
United States [Member] | Reportable Geographical Components [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									460,599	420,821	441,664
Foreign Countries [Member] | Reportable Geographical Components [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									134,191	132,383	110,828
North America [Member] | Reportable Geographical Components [Member]
Long-lived assets, excluding intangible assets [Abstract]
Long-lived assets, excluding intangible assets	175,027				154,007				175,027	154,007	148,209
Europe [Member] | Reportable Geographical Components [Member]
Long-lived assets, excluding intangible assets [Abstract]
Long-lived assets, excluding intangible assets	$ 14,766				$ 11,747				$ 14,766	$ 11,747	$ 10,306